<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilities" xlink:href="exls-20171231.xsd#AccruedExpensesAndOtherCurrentLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:href="exls-20171231.xsd#AccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:href="exls-20171231.xsd#AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLoss" xlink:href="exls-20171231.xsd#AccumulatedOtherComprehensiveLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:href="exls-20171231.xsd#AccumulatedOtherComprehensiveLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLossTables" xlink:href="exls-20171231.xsd#AccumulatedOtherComprehensiveLossTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/Borrowings" xlink:href="exls-20171231.xsd#Borrowings" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BorrowingsAdditionalInformationDetail" xlink:href="exls-20171231.xsd#BorrowingsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssets" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsAdditionalInformationDetails" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsPurchasePriceAllocationDetails" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsPurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsUnauditedProFormaFinancialInformationDetails" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsUnauditedProFormaFinancialInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsEstimatedFutureAmortizationOfIntangibleAssetsDetail" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsEstimatedFutureAmortizationOfIntangibleAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysGoodwillDetail" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysGoodwillDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysIntangibleAssetsDetail" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysIntangibleAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsTables" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsWeightedAverageLifeOfIntangibleAssetsDetails" xlink:href="exls-20171231.xsd#BusinessCombinationsGoodwillAndIntangibleAssetsWeightedAverageLifeOfIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/CapitalStructure" xlink:href="exls-20171231.xsd#CapitalStructure" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/CapitalStructureAdditionalInformationDetail" xlink:href="exls-20171231.xsd#CapitalStructureAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/CommitmentsAndContingencies" xlink:href="exls-20171231.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:href="exls-20171231.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedBalanceSheets" xlink:href="exls-20171231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="exls-20171231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="exls-20171231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="exls-20171231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:href="exls-20171231.xsd#ConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedStatementsOfEquity" xlink:href="exls-20171231.xsd#ConsolidatedStatementsOfEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/ConsolidatedStatementsOfIncome" xlink:href="exls-20171231.xsd#ConsolidatedStatementsOfIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccounting" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccounting" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccountingAdditionalInformationDetail" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccountingAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccountingDerivativesAndHedgeAccountingLocationOfGainOrLossRecognizedDetails" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccountingDerivativesAndHedgeAccountingLocationOfGainOrLossRecognizedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccountingSummaryOfEffectOfForeignCurrencyExchangeContractsDetail" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccountingSummaryOfEffectOfForeignCurrencyExchangeContractsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccountingSummaryOfFairValueOfForeignCurrencyExchangeContractsDetail" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccountingSummaryOfFairValueOfForeignCurrencyExchangeContractsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DerivativesAndHedgeAccountingTables" xlink:href="exls-20171231.xsd#DerivativesAndHedgeAccountingTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/DocumentAndEntityInformation" xlink:href="exls-20171231.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EarningsPerShare" xlink:href="exls-20171231.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EarningsPerShareDetails" xlink:href="exls-20171231.xsd#EarningsPerShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EarningsPerShareTables" xlink:href="exls-20171231.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlans" xlink:href="exls-20171231.xsd#EmployeeBenefitPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansAdditionalInformationDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansChangeInPlanAssetsDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansChangeInPlanAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansNetGratuityCostDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansNetGratuityCostDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfChangeInProjectedBenefitObligationDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansSummaryOfChangeInProjectedBenefitObligationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfComponentsAccumulatedOtherComprehensiveLossDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansSummaryOfComponentsAccumulatedOtherComprehensiveLossDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfExpectedBenefitPaymentsDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansSummaryOfExpectedBenefitPaymentsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfWeightedAverageActuarialAssumptionsDetail" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansSummaryOfWeightedAverageActuarialAssumptionsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/EmployeeBenefitPlansTables" xlink:href="exls-20171231.xsd#EmployeeBenefitPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/FairValueMeasurements" xlink:href="exls-20171231.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:href="exls-20171231.xsd#FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/FairValueMeasurementsTables" xlink:href="exls-20171231.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxes" xlink:href="exls-20171231.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesAdditionalInformationDetail" xlink:href="exls-20171231.xsd#IncomeTaxesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesSummaryOfActivityRelatedToGrossUnrecognizedTaxBenefitsDetail" xlink:href="exls-20171231.xsd#IncomeTaxesSummaryOfActivityRelatedToGrossUnrecognizedTaxBenefitsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesSummaryOfComponentsOfDeferredTaxBalancesDetail" xlink:href="exls-20171231.xsd#IncomeTaxesSummaryOfComponentsOfDeferredTaxBalancesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesSummaryOfComponentsOfIncomeBeforeIncomeTaxesDetail" xlink:href="exls-20171231.xsd#IncomeTaxesSummaryOfComponentsOfIncomeBeforeIncomeTaxesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesSummaryOfEffectiveIncomeTaxRateDiffersFromAmountComputedByApplyingUSFederalStatutoryIncomeTaxRateToIncomeBeforeIncomeTaxesDetail" xlink:href="exls-20171231.xsd#IncomeTaxesSummaryOfEffectiveIncomeTaxRateDiffersFromAmountComputedByApplyingUSFederalStatutoryIncomeTaxRateToIncomeBeforeIncomeTaxesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesSummaryOfIncomeTaxExpenseDetail" xlink:href="exls-20171231.xsd#IncomeTaxesSummaryOfIncomeTaxExpenseDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/IncomeTaxesTables" xlink:href="exls-20171231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/InvestmentInEquityAffiliate" xlink:href="exls-20171231.xsd#InvestmentInEquityAffiliate" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/InvestmentInEquityAffiliateDetails" xlink:href="exls-20171231.xsd#InvestmentInEquityAffiliateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/Leases" xlink:href="exls-20171231.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/LeasesFutureMinimumLeasePaymentsUnderCapitalLeasesDetail" xlink:href="exls-20171231.xsd#LeasesFutureMinimumLeasePaymentsUnderCapitalLeasesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/LeasesFutureMinimumLeasePaymentsUnderNonCancelableOperatingLeaseAgreementsExpiringAfterDecember312016Detail" xlink:href="exls-20171231.xsd#LeasesFutureMinimumLeasePaymentsUnderNonCancelableOperatingLeaseAgreementsExpiringAfterDecember312016Detail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/LeasesRentExpenseAndDeferredRentDetail" xlink:href="exls-20171231.xsd#LeasesRentExpenseAndDeferredRentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/LeasesTables" xlink:href="exls-20171231.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/NatureOfOperationAndOrganization" xlink:href="exls-20171231.xsd#NatureOfOperationAndOrganization" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/NonCurrentLiabilities" xlink:href="exls-20171231.xsd#NonCurrentLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/NonCurrentLiabilitiesSummaryOfNonCurrentLiabilitiesDetails" xlink:href="exls-20171231.xsd#NonCurrentLiabilitiesSummaryOfNonCurrentLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/NonCurrentLiabilitiesTables" xlink:href="exls-20171231.xsd#NonCurrentLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherCurrentAssets" xlink:href="exls-20171231.xsd#OtherCurrentAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherCurrentAssetsDetails" xlink:href="exls-20171231.xsd#OtherCurrentAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherCurrentAssetsTables" xlink:href="exls-20171231.xsd#OtherCurrentAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherIncomeNet" xlink:href="exls-20171231.xsd#OtherIncomeNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherIncomeNetSummaryOfOtherIncomeNetDetails" xlink:href="exls-20171231.xsd#OtherIncomeNetSummaryOfOtherIncomeNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/OtherIncomeNetTables" xlink:href="exls-20171231.xsd#OtherIncomeNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/PropertyAndEquipment" xlink:href="exls-20171231.xsd#PropertyAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/PropertyAndEquipmentDepreciationAndAmortizationExpenseDetail" xlink:href="exls-20171231.xsd#PropertyAndEquipmentDepreciationAndAmortizationExpenseDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/PropertyAndEquipmentPropertyAndEquipmentInternallyDevelopedSoftwareCostsIncludedUnderSoftwareDetails" xlink:href="exls-20171231.xsd#PropertyAndEquipmentPropertyAndEquipmentInternallyDevelopedSoftwareCostsIncludedUnderSoftwareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/PropertyAndEquipmentScheduleOfPropertyAndEquipmentDetail" xlink:href="exls-20171231.xsd#PropertyAndEquipmentScheduleOfPropertyAndEquipmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/PropertyAndEquipmentTables" xlink:href="exls-20171231.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/QuarterlyFinancialDataUnaudited" xlink:href="exls-20171231.xsd#QuarterlyFinancialDataUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/QuarterlyFinancialDataUnauditedSummaryOfQuarterlyResultsDetail" xlink:href="exls-20171231.xsd#QuarterlyFinancialDataUnauditedSummaryOfQuarterlyResultsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/QuarterlyFinancialDataUnauditedTables" xlink:href="exls-20171231.xsd#QuarterlyFinancialDataUnauditedTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/RelatedPartyDisclosures" xlink:href="exls-20171231.xsd#RelatedPartyDisclosures" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/RelatedPartyDisclosuresDetails" xlink:href="exls-20171231.xsd#RelatedPartyDisclosuresDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SegmentGeographicalInformation" xlink:href="exls-20171231.xsd#SegmentGeographicalInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SegmentGeographicalInformationAdditionalInformationDetail" xlink:href="exls-20171231.xsd#SegmentGeographicalInformationAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SegmentGeographicalInformationRevenuesAndCostOfRevenuesForCompanysReportableSegmentsDetail" xlink:href="exls-20171231.xsd#SegmentGeographicalInformationRevenuesAndCostOfRevenuesForCompanysReportableSegmentsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SegmentGeographicalInformationRevenuesAndPropertyAndEquipmentNetBasedOnGeographicalInformationDetails" xlink:href="exls-20171231.xsd#SegmentGeographicalInformationRevenuesAndPropertyAndEquipmentNetBasedOnGeographicalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SegmentGeographicalInformationTables" xlink:href="exls-20171231.xsd#SegmentGeographicalInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensation" xlink:href="exls-20171231.xsd#StockBasedCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationAdditionalInformationDetail" xlink:href="exls-20171231.xsd#StockBasedCompensationAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationCompanysStockOptionsOutstandingAndStockOptionsVestedAndExercisableDetail" xlink:href="exls-20171231.xsd#StockBasedCompensationCompanysStockOptionsOutstandingAndStockOptionsVestedAndExercisableDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationCostsRelatedToCompanysStockBasedCompensationPlanDetail" xlink:href="exls-20171231.xsd#StockBasedCompensationCostsRelatedToCompanysStockBasedCompensationPlanDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationPerformanceBasedStockAwardsAdditionalInformationDetails" xlink:href="exls-20171231.xsd#StockBasedCompensationPerformanceBasedStockAwardsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationPerformanceRestrictedStockActivityDetails" xlink:href="exls-20171231.xsd#StockBasedCompensationPerformanceRestrictedStockActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationRestrictedStockActivityUnderCompanysStockPlansDetail" xlink:href="exls-20171231.xsd#StockBasedCompensationRestrictedStockActivityUnderCompanysStockPlansDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationRestrictedStockAndRsuAdditionalInformationDetails" xlink:href="exls-20171231.xsd#StockBasedCompensationRestrictedStockAndRsuAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationShareBasedCompensationSummaryOfWeightedAverageValuationAssumptionsForMarketConditionPerformanceRestrictedStockUnitsDetails" xlink:href="exls-20171231.xsd#StockBasedCompensationShareBasedCompensationSummaryOfWeightedAverageValuationAssumptionsForMarketConditionPerformanceRestrictedStockUnitsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationStockBasedCompensationStockOptionActivityDetail" xlink:href="exls-20171231.xsd#StockBasedCompensationStockBasedCompensationStockOptionActivityDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationStockOptionsAdditionalInformationDetails" xlink:href="exls-20171231.xsd#StockBasedCompensationStockOptionsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/StockBasedCompensationTables" xlink:href="exls-20171231.xsd#StockBasedCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesAccountsReceivableAdditionalInformationDetails" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesAccountsReceivableAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesShareBasedCompensationAdditionalInformationDetails" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesShareBasedCompensationAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfLivedIntangibleAssetsAmortizedOverTheirEstimatedUsefulLivesDetail" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfLivedIntangibleAssetsAmortizedOverTheirEstimatedUsefulLivesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfRevenuesAndReimbursementsAdditionalInformationDetails" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfRevenuesAndReimbursementsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesScheduleOfPropertyAndEquipmentEstimatedUsefulLivesDetails" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesScheduleOfPropertyAndEquipmentEstimatedUsefulLivesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:href="exls-20171231.xsd#SummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilitiesSummaryOfAccruedExpensesAndOtherCurrentLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccruedExpensesAndOtherCurrentLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLoss" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLossDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/AccumulatedOtherComprehensiveLossTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/Borrowings" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BorrowingsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_55C205B44C4D32C3ACC7AF22C7AC2460" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:to="loc_us-gaap_CreditFacilityAxis_55C205B44C4D32C3ACC7AF22C7AC2460" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_A254FCCDE70D44E872E3AF22C7AC5201_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_55C205B44C4D32C3ACC7AF22C7AC2460" xlink:to="loc_us-gaap_CreditFacilityDomain_A254FCCDE70D44E872E3AF22C7AC5201_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_A254FCCDE70D44E872E3AF22C7AC5201" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_55C205B44C4D32C3ACC7AF22C7AC2460" xlink:to="loc_us-gaap_CreditFacilityDomain_A254FCCDE70D44E872E3AF22C7AC5201" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_D453FCA3F9427C180002AF22C7AD5309" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_A254FCCDE70D44E872E3AF22C7AC5201" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_D453FCA3F9427C180002AF22C7AD5309" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_9E7BB81A29A8EFD5C45EAF22C7AD0174" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:to="loc_us-gaap_DebtInstrumentAxis_9E7BB81A29A8EFD5C45EAF22C7AD0174" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_9E7BB81A29A8EFD5C45EAF22C7AD0174" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_9E7BB81A29A8EFD5C45EAF22C7AD0174" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_CreditFacilityMember" xlink:label="loc_exls_CreditFacilityMember_04E7F10E02792365A452AF22C7AD5FCB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74" xlink:to="loc_exls_CreditFacilityMember_04E7F10E02792365A452AF22C7AD5FCB" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_NewCreditAgreementMember" xlink:label="loc_exls_NewCreditAgreementMember_187E16CDCA0A68571A1BAF22C7ADBEE7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_CD502F237A35796C25BCAF22C7ADCF74" xlink:to="loc_exls_NewCreditAgreementMember_187E16CDCA0A68571A1BAF22C7ADBEE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_5D1440B17B183AC579ECAF22C7ADB820" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:to="loc_us-gaap_VariableRateAxis_5D1440B17B183AC579ECAF22C7ADB820" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_5D1440B17B183AC579ECAF22C7ADB820" xlink:to="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_5D1440B17B183AC579ECAF22C7ADB820" xlink:to="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PrimeRateMember" xlink:label="loc_us-gaap_PrimeRateMember_A229317E5394934708B4AF22C7AD86C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D" xlink:to="loc_us-gaap_PrimeRateMember_A229317E5394934708B4AF22C7AD86C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_B996405EB61B07EFB520AF22C7ADE657" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_5F0DF96500F469261E96AF22C7ADE10D" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_B996405EB61B07EFB520AF22C7ADE657" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_DBDE21E785971E9E6C47AF22C7ADD0A7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:to="loc_us-gaap_RangeAxis_DBDE21E785971E9E6C47AF22C7ADD0A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_DBDE21E785971E9E6C47AF22C7ADD0A7" xlink:to="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_DBDE21E785971E9E6C47AF22C7ADD0A7" xlink:to="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_D04D6BA762C5563136B8AF22C7AD804D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA" xlink:to="loc_us-gaap_MinimumMember_D04D6BA762C5563136B8AF22C7AD804D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_57B1CC3A33B8C8767B79AF22C7AD852C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_4D637B80BC2EF13BF179AF22C7AD3DCA" xlink:to="loc_us-gaap_MaximumMember_57B1CC3A33B8C8767B79AF22C7AD852C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_44005E3FA7F0C286363FAF22C7ADBD7F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_51C673A842C17F9138E0AF22C7AC7442" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_44005E3FA7F0C286363FAF22C7ADBD7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_FC3788D604272255DC06AF22C7AD17DF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_44005E3FA7F0C286363FAF22C7ADBD7F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_FC3788D604272255DC06AF22C7AD17DF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_FC3788D604272255DC06AF22C7AD17DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_44005E3FA7F0C286363FAF22C7ADBD7F" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_FC3788D604272255DC06AF22C7AD17DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NotesPayableOtherPayablesMember" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_A7D5C1F01143017D8A15AF22C7AD84B1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_FC3788D604272255DC06AF22C7AD17DF" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_A7D5C1F01143017D8A15AF22C7AD84B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_3DBD9410CDC63F8A9BD7AF22C7AD9504" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LineOfCredit_3DBD9410CDC63F8A9BD7AF22C7AD9504" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity" xlink:label="loc_exls_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity_D0DCB538C2BF39AEACF2AF22C7AD9389" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_exls_LineOfCreditFacilityOptionForAdditionalBorrowingCapacity_D0DCB538C2BF39AEACF2AF22C7AD9389" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_069B3557AC6FE4C20854AF22C7AD9F01" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_069B3557AC6FE4C20854AF22C7AD9F01" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_BF670C2E6D082382E3A2AF22C7AEAAE4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_BF670C2E6D082382E3A2AF22C7AEAAE4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_8FDEE2568F0B7FB7EFFFAF22C7AE04CF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_8FDEE2568F0B7FB7EFFFAF22C7AE04CF" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_DebtInstrumentCovenantInterestCoverageRatioMinimum" xlink:label="loc_exls_DebtInstrumentCovenantInterestCoverageRatioMinimum_4CDE10D6AE744DBF0AF8AF22C7AEA963" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_exls_DebtInstrumentCovenantInterestCoverageRatioMinimum_4CDE10D6AE744DBF0AF8AF22C7AEA963" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_DebtInstrumentCovenantLeverageRatioMaximum" xlink:label="loc_exls_DebtInstrumentCovenantLeverageRatioMaximum_3A462E214F32B546FB64AF247A3B3A4B" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_exls_DebtInstrumentCovenantLeverageRatioMaximum_3A462E214F32B546FB64AF247A3B3A4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_95EB16B6F05FD04E35B4AF22C7AE6243" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LongTermDebtCurrent_95EB16B6F05FD04E35B4AF22C7AE6243" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_59078AE22458F1D9F7DEAF22C7AED451" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_59078AE22458F1D9F7DEAF22C7AED451" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_0B345DED5A6CE502BF69AF22C7AE5B37" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_0B345DED5A6CE502BF69AF22C7AE5B37" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_UnamortizedDeferredFinanceCosts" xlink:label="loc_exls_UnamortizedDeferredFinanceCosts_16ADB7DC042858D9D115AF22C7AE3237" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_exls_UnamortizedDeferredFinanceCosts_16ADB7DC042858D9D115AF22C7AE3237" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_E10B4A85BE795EFD70F7AF22C7AEF1F5" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4C5D77DC122D47B70415AF22C7AD40B4" xlink:to="loc_us-gaap_LongTermDebt_E10B4A85BE795EFD70F7AF22C7AEF1F5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_E54C09C5061D8EAA403BD5A30A24FD3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:to="loc_us-gaap_AwardTypeAxis_E54C09C5061D8EAA403BD5A30A24FD3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E0704901E5B7527DE2A6D5A30A2410DB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_E54C09C5061D8EAA403BD5A30A24FD3B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E0704901E5B7527DE2A6D5A30A2410DB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E0704901E5B7527DE2A6D5A30A2410DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_E54C09C5061D8EAA403BD5A30A24FD3B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E0704901E5B7527DE2A6D5A30A2410DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_04540A64D152A63F4E78D5A30A24DA7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_E0704901E5B7527DE2A6D5A30A2410DB" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_04540A64D152A63F4E78D5A30A24DA7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_87E7E7592E78ACBD4062D5A30A24BE14" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_87E7E7592E78ACBD4062D5A30A24BE14" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FB9EEB57B6DC8309354AD5A30A24111C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_87E7E7592E78ACBD4062D5A30A24BE14" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FB9EEB57B6DC8309354AD5A30A24111C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FB9EEB57B6DC8309354AD5A30A24111C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_87E7E7592E78ACBD4062D5A30A24BE14" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FB9EEB57B6DC8309354AD5A30A24111C" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_HealthIntegratedInc.Member" xlink:label="loc_exls_HealthIntegratedInc.Member_8393653539D017D5DEC5D5A30A24F6F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_FB9EEB57B6DC8309354AD5A30A24111C" xlink:to="loc_exls_HealthIntegratedInc.Member_8393653539D017D5DEC5D5A30A24F6F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_583C7D79956467E109ACD5A30A246757" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_583C7D79956467E109ACD5A30A246757" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_583C7D79956467E109ACD5A30A246757" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_583C7D79956467E109ACD5A30A246757" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_4A0BFBD3A52A3515F5B0D5A30A2494F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED" xlink:to="loc_us-gaap_CustomerRelationshipsMember_4A0BFBD3A52A3515F5B0D5A30A2494F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_4ABC71CE8C406C464081D5A30A25F14B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_4ABC71CE8C406C464081D5A30A25F14B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_C92299271C8FB194F86FD5A30A2547A2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_AC6F0147F588CFE74205D5A30A24E1ED" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_C92299271C8FB194F86FD5A30A2547A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_BC13592413F6798B891BD5A30A2558CE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A8FD5130FBE922BA3400D5A30A2454BB" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_BC13592413F6798B891BD5A30A2558CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FDD769DEF61E6DFF3021D5A30A2552C1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_BC13592413F6798B891BD5A30A2558CE" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FDD769DEF61E6DFF3021D5A30A2552C1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FDD769DEF61E6DFF3021D5A30A2552C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_BC13592413F6798B891BD5A30A2558CE" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FDD769DEF61E6DFF3021D5A30A2552C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_475705960EA5EF8F23A0D5A30A256803" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_FDD769DEF61E6DFF3021D5A30A2552C1" xlink:to="loc_us-gaap_SubsequentEventMember_475705960EA5EF8F23A0D5A30A256803" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_410C0C101657FE767D80D5A30A2543B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_410C0C101657FE767D80D5A30A2543B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_2D78E176075F12A23A01D5A30A259DB8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_2D78E176075F12A23A01D5A30A259DB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_E1E64DD61546ACC23EB6D5A30A256DC9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_E1E64DD61546ACC23EB6D5A30A256DC9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_141F89E3294C68B3984BD5A30A255C5D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_141F89E3294C68B3984BD5A30A255C5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1B59FCBD32610D5539AED5A30A25C47B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_1B59FCBD32610D5539AED5A30A25C47B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_A3E2CE26122FA5D9ABB5D5A30A25C2A5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_A3E2CE26122FA5D9ABB5D5A30A25C2A5" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue" xlink:label="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue_0EBAFF6F0AED6BC4B5E4D5A30A255DDE" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue_0EBAFF6F0AED6BC4B5E4D5A30A255DDE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_02F64628FF67A59981B2D5A30A252D36" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_502E7A06195CCC011247D5A30A25F4EA" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_02F64628FF67A59981B2D5A30A252D36" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsPurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4BF703131C75007C1058B811F962A2B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4BF703131C75007C1058B811F962A2B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_127541179F897A9026598B811F96795C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4BF703131C75007C1058B811F962A2B" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_127541179F897A9026598B811F96795C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_99968E79CC7389B016698B811F974711_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_127541179F897A9026598B811F96795C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_99968E79CC7389B016698B811F974711_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_99968E79CC7389B016698B811F974711" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_127541179F897A9026598B811F96795C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_99968E79CC7389B016698B811F974711" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_HealthIntegratedInc.Member" xlink:label="loc_exls_HealthIntegratedInc.Member_0E772E51A95424704D298B811F97B969" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_99968E79CC7389B016698B811F974711" xlink:to="loc_exls_HealthIntegratedInc.Member_0E772E51A95424704D298B811F97B969" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ED67DCFDAD660A389AD28B811F9765B2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_A4BF703131C75007C1058B811F962A2B" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ED67DCFDAD660A389AD28B811F9765B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ED67DCFDAD660A389AD28B811F9765B2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ED67DCFDAD660A389AD28B811F9765B2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_C7339856FE8787744EFC8B811F98451D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58" xlink:to="loc_us-gaap_CustomerRelationshipsMember_C7339856FE8787744EFC8B811F98451D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_326B540175EBEB6509F78B811F98611A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_326B540175EBEB6509F78B811F98611A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_C0598C0AC8900F4D63478B811F989F67" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_CC4D6E204F2706F8319B8B811F977C58" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_C0598C0AC8900F4D63478B811F989F67" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets" xlink:label="loc_exls_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_667CA2FF573FEF8AFC6B8B811F980BAF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_exls_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTangibleAssets_667CA2FF573FEF8AFC6B8B811F980BAF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_4730817EF989FAA5AE508B811F98A3CD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_4730817EF989FAA5AE508B811F98A3CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_C81095B7920004709BA88B811F989406" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_C81095B7920004709BA88B811F989406" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_061AFFACB1EA1FC512498B811F99A73D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_us-gaap_Goodwill_061AFFACB1EA1FC512498B811F99A73D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_984AD986E9952CC21CF28B811F99FCE9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_87FF768907A16B210ED18B811F989893" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_984AD986E9952CC21CF28B811F99FCE9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsBusinessCombinationsGoodwillAndIntangibleAssetsUnauditedProFormaFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_3C83C457A18339E4D38ED5A30A1B54E0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_EF797C0C9FEFF5A45518D5A30A1B68D6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3C83C457A18339E4D38ED5A30A1B54E0" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_EF797C0C9FEFF5A45518D5A30A1B68D6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_2E01351A126D729D41E0D5A30A1B9850" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_EF797C0C9FEFF5A45518D5A30A1B68D6" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_2E01351A126D729D41E0D5A30A1B9850" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_996ADEE1D3C704F030D2D5A30A1B6274_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2E01351A126D729D41E0D5A30A1B9850" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_996ADEE1D3C704F030D2D5A30A1B6274_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_996ADEE1D3C704F030D2D5A30A1B6274" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2E01351A126D729D41E0D5A30A1B9850" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_996ADEE1D3C704F030D2D5A30A1B6274" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_HealthIntegratedInc.Member" xlink:label="loc_exls_HealthIntegratedInc.Member_CF7141C651045F1A90E1D5A30A1B12C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_996ADEE1D3C704F030D2D5A30A1B6274" xlink:to="loc_exls_HealthIntegratedInc.Member_CF7141C651045F1A90E1D5A30A1B12C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_AD57BC5C93F25D180797D5A30A1C0D87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3C83C457A18339E4D38ED5A30A1B54E0" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_AD57BC5C93F25D180797D5A30A1C0D87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_6623A63ED66F34589C7DD5A30A1CABA4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3C83C457A18339E4D38ED5A30A1B54E0" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_6623A63ED66F34589C7DD5A30A1CABA4" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_BusinessAcquisitionEarningsPerShareAbstract" xlink:label="loc_exls_BusinessAcquisitionEarningsPerShareAbstract_7F0CC1D6C916871779FDD5A30A1C918A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_3C83C457A18339E4D38ED5A30A1B54E0" xlink:to="loc_exls_BusinessAcquisitionEarningsPerShareAbstract_7F0CC1D6C916871779FDD5A30A1C918A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_C04DBB10E4667599466ED5A30A1C45EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_BusinessAcquisitionEarningsPerShareAbstract_7F0CC1D6C916871779FDD5A30A1C918A" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_C04DBB10E4667599466ED5A30A1C45EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_25BE879E5DD23E2E69F5D5A30A1CA3C6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_BusinessAcquisitionEarningsPerShareAbstract_7F0CC1D6C916871779FDD5A30A1C918A" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_25BE879E5DD23E2E69F5D5A30A1CA3C6" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsEstimatedFutureAmortizationOfIntangibleAssetsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysGoodwillDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_4572A730EF3D2CA5294D77F309AFD7B9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_657E8ACF18FFE524F87D77F309AFFB42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_4572A730EF3D2CA5294D77F309AFD7B9" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_657E8ACF18FFE524F87D77F309AFFB42" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7A1F5A1786BA373E768077F309AFB9F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_657E8ACF18FFE524F87D77F309AFFB42" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7A1F5A1786BA373E768077F309AFB9F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7A1F5A1786BA373E768077F309AFB9F2" xlink:to="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7A1F5A1786BA373E768077F309AFB9F2" xlink:to="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_InsuranceMember" xlink:label="loc_exls_InsuranceMember_C81280FC6C0DCEAFA99F77F309AFC693" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_InsuranceMember_C81280FC6C0DCEAFA99F77F309AFC693" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_HealthcareMember" xlink:label="loc_exls_HealthcareMember_A7E0BA4F8CB66AC6BAF977F309AF411E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_HealthcareMember_A7E0BA4F8CB66AC6BAF977F309AF411E" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TravelTransportationandLogisticsMember" xlink:label="loc_exls_TravelTransportationandLogisticsMember_5E0EC00E5683C809924877F309AF9508" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_TravelTransportationandLogisticsMember_5E0EC00E5683C809924877F309AF9508" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_FinanceandAccountingMember" xlink:label="loc_exls_FinanceandAccountingMember_C403F8CCC39AF775D8C977F309AF9C2B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_FinanceandAccountingMember_C403F8CCC39AF775D8C977F309AF9C2B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_OtherOperationsManagementMember" xlink:label="loc_exls_OtherOperationsManagementMember_B652C27E721AA9CB89D277F309AF081F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_OtherOperationsManagementMember_B652C27E721AA9CB89D277F309AF081F" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AnalyticsMember" xlink:label="loc_exls_AnalyticsMember_A2810885C12A78503DF077F309AFFC46" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_D9A8C7AB4C1E958FBC7A77F309AF5C9F" xlink:to="loc_exls_AnalyticsMember_A2810885C12A78503DF077F309AFFC46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillRollForward" xlink:label="loc_us-gaap_GoodwillRollForward_827B30585439D8FF887C77F309B00803" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_4572A730EF3D2CA5294D77F309AFD7B9" xlink:to="loc_us-gaap_GoodwillRollForward_827B30585439D8FF887C77F309B00803" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_86D0ECE67870A1533ECE77F309B05FAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_827B30585439D8FF887C77F309B00803" xlink:to="loc_us-gaap_Goodwill_86D0ECE67870A1533ECE77F309B05FAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_1FB060B98399ADF6C1F377F309B08650" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_827B30585439D8FF887C77F309B00803" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_1FB060B98399ADF6C1F377F309B08650" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_3BEE911DACA3EB10430677F309B04F06" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_827B30585439D8FF887C77F309B00803" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_3BEE911DACA3EB10430677F309B04F06" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsSummaryOfCompanysIntangibleAssetsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4201239ECEA20733CD8D8214DAB0A151" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4201239ECEA20733CD8D8214DAB0A151" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_D61F8EA21AFEB4C0EC868214DAB0AB53" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4201239ECEA20733CD8D8214DAB0A151" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_D61F8EA21AFEB4C0EC868214DAB0AB53" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_C42D80E8C0E469A6FF768214DAB0DD8A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_D61F8EA21AFEB4C0EC868214DAB0AB53" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_C42D80E8C0E469A6FF768214DAB0DD8A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_C42D80E8C0E469A6FF768214DAB0DD8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_D61F8EA21AFEB4C0EC868214DAB0AB53" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_C42D80E8C0E469A6FF768214DAB0DD8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_92CD3D26AD8E273336178214DAB19BF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_C42D80E8C0E469A6FF768214DAB0DD8A" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_92CD3D26AD8E273336178214DAB19BF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B20E1D0A84771D12BB828214DAB1793D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4201239ECEA20733CD8D8214DAB0A151" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B20E1D0A84771D12BB828214DAB1793D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B20E1D0A84771D12BB828214DAB1793D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_B20E1D0A84771D12BB828214DAB1793D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_455CAC6B6EFDD7C14C518214DAB1F2B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:to="loc_us-gaap_CustomerRelationshipsMember_455CAC6B6EFDD7C14C518214DAB1F2B8" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_LeaseholdBenefitsMember" xlink:label="loc_exls_LeaseholdBenefitsMember_44E60DAA60B07CFD6FAB8214DAB14272" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:to="loc_exls_LeaseholdBenefitsMember_44E60DAA60B07CFD6FAB8214DAB14272" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_39D2C230A2F9836155FC8214DAB18F05" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_39D2C230A2F9836155FC8214DAB18F05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_7B4033EA46CC91D16D348214DAB13620" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_7B4033EA46CC91D16D348214DAB13620" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_238036D0F60FEDCCBB9E8214DAB143DD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6327380FD093706A11228214DAB1F123" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_238036D0F60FEDCCBB9E8214DAB143DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_A2EEF66812171008A55A8214DAB1AEF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_A2EEF66812171008A55A8214DAB1AEF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1619FF26EC9CFE6E739D8214DAB13E4E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1619FF26EC9CFE6E739D8214DAB13E4E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_59A458176A6B425F3D6C8214DAB1CB1A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_59A458176A6B425F3D6C8214DAB1CB1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_B80FA577282CC2AC3A448214DAB1A122" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_B80FA577282CC2AC3A448214DAB1A122" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_A31D0A5F4D0B2D36103A8214DAB14FE1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_A31D0A5F4D0B2D36103A8214DAB14FE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8DD1DEC21416AAFCC9DF8214DAB16068" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_4E800D46258EED55D67E8214DAB1C2F9" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8DD1DEC21416AAFCC9DF8214DAB16068" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/BusinessCombinationsGoodwillAndIntangibleAssetsWeightedAverageLifeOfIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_0C2CE04C91DEDA20E2B177F43D2AE7B5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_7907696DA43F9A14F4A477F43D2AE3D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_0C2CE04C91DEDA20E2B177F43D2AE7B5" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_7907696DA43F9A14F4A477F43D2AE3D3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_46D2EFCFA1B085975FC077F43D2A274D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_7907696DA43F9A14F4A477F43D2AE3D3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_46D2EFCFA1B085975FC077F43D2A274D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_46D2EFCFA1B085975FC077F43D2A274D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_46D2EFCFA1B085975FC077F43D2A274D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_45C681C834B4CE9270CB77F43D2AE1C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:to="loc_us-gaap_CustomerRelationshipsMember_45C681C834B4CE9270CB77F43D2AE1C3" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_LeaseholdBenefitsMember" xlink:label="loc_exls_LeaseholdBenefitsMember_16048FC7909CD4E0FCE777F43D2AF003" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:to="loc_exls_LeaseholdBenefitsMember_16048FC7909CD4E0FCE777F43D2AF003" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_D900EF720F01C6E6959277F43D2A9565" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_D900EF720F01C6E6959277F43D2A9565" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_BE6B2EB380E7D041086277F43D2A90E3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_BE6B2EB380E7D041086277F43D2A90E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_B2AAF701CBF648C75C9077F43D2A21B3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_FB5599B81DE0C01257AC77F43D2A8A30" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_B2AAF701CBF648C75C9077F43D2A21B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_908AEA9584FD4D86F9BA77F43D2A5232" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_0C2CE04C91DEDA20E2B177F43D2AE7B5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_908AEA9584FD4D86F9BA77F43D2A5232" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/CapitalStructure" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/CapitalStructureAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityClassOfTreasuryStockLineItems" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ClassOfTreasuryStockTable" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_1094B34B0FC9BEB9401F23BEECC1567F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_1094B34B0FC9BEB9401F23BEECC1567F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_45E31C475AD6BFD0833C23BEECC693C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_1094B34B0FC9BEB9401F23BEECC1567F" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_45E31C475AD6BFD0833C23BEECC693C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_45E31C475AD6BFD0833C23BEECC693C7" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_45E31C475AD6BFD0833C23BEECC693C7" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TwoThousandFourteenRepurchaseProgramMember" xlink:label="loc_exls_TwoThousandFourteenRepurchaseProgramMember_48440FBC3F9229E2150723BEECC6960B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E" xlink:to="loc_exls_TwoThousandFourteenRepurchaseProgramMember_48440FBC3F9229E2150723BEECC6960B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TwoThousandSeventeenRepurchaseProgramMember" xlink:label="loc_exls_TwoThousandSeventeenRepurchaseProgramMember_04E968384D77D12177E023BEECC678F1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E" xlink:to="loc_exls_TwoThousandSeventeenRepurchaseProgramMember_04E968384D77D12177E023BEECC678F1" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TwoThousandFourteenandTwoThousandSeventeenRepurchaseProgramMember" xlink:label="loc_exls_TwoThousandFourteenandTwoThousandSeventeenRepurchaseProgramMember_74304F6D44420DBAFFE823BEECC61F7C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_6DC4C90A089A3203480423BEECC6FC2E" xlink:to="loc_exls_TwoThousandFourteenandTwoThousandSeventeenRepurchaseProgramMember_74304F6D44420DBAFFE823BEECC61F7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_BBCA2858B59A803DFA5823BEECC33BAE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_1094B34B0FC9BEB9401F23BEECC1567F" xlink:to="loc_us-gaap_RangeAxis_BBCA2858B59A803DFA5823BEECC33BAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_BBCA2858B59A803DFA5823BEECC33BAE" xlink:to="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_BBCA2858B59A803DFA5823BEECC33BAE" xlink:to="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_A652BF221B4512D8D7AF23BEECC33489" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5" xlink:to="loc_us-gaap_MinimumMember_A652BF221B4512D8D7AF23BEECC33489" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_40B636324C99274D25FF23BEECC6033A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_A00FD8950D2AEECF5C3C23BEECC3E1E5" xlink:to="loc_us-gaap_MaximumMember_40B636324C99274D25FF23BEECC6033A" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_NumberOfClassesOfCommonStockOutstanding" xlink:label="loc_exls_NumberOfClassesOfCommonStockOutstanding_02B4DA6C92D14836D49023BEECC6EAE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_NumberOfClassesOfCommonStockOutstanding_02B4DA6C92D14836D49023BEECC6EAE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_5E7CCD8CC16C25487B5623BEECC67481" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_5E7CCD8CC16C25487B5623BEECC67481" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_3F1DE0B9D5BE078C660623BEECC649C5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_3F1DE0B9D5BE078C660623BEECC649C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare" xlink:label="loc_us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare_36CFD85862D003D7219223BEECC621E9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare_36CFD85862D003D7219223BEECC621E9" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramPeriodStart" xlink:label="loc_exls_StockRepurchaseProgramPeriodStart_9FFEA7471719B3FC7B3A23BEECC6C6FF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramPeriodStart_9FFEA7471719B3FC7B3A23BEECC6C6FF" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramPeriodEnd" xlink:label="loc_exls_StockRepurchaseProgramPeriodEnd_4E592A935990D22FDD0023BEECC88D7C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramPeriodEnd_4E592A935990D22FDD0023BEECC88D7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_D9B83AB6C62C9B6295A123BEECC663F6" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_D9B83AB6C62C9B6295A123BEECC663F6" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramAdditionalAuthorizedAmount" xlink:label="loc_exls_StockRepurchaseProgramAdditionalAuthorizedAmount_4375ABB3BC17AF487CD323BEECC85A51" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramAdditionalAuthorizedAmount_4375ABB3BC17AF487CD323BEECC85A51" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriod" xlink:label="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriod_CEA845DA20BAA111E2D223BEECC8E8CA" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriod_CEA845DA20BAA111E2D223BEECC8E8CA" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearTwo" xlink:label="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearTwo_7F406C64FBC08B0AABDB23BEECC8F39D" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearTwo_7F406C64FBC08B0AABDB23BEECC8F39D" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearThree" xlink:label="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearThree_4F4719A330854960D71923BEECC8C2D1" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_StockRepurchaseProgramAuthorizedIncreaseinRepurchaseAmountPerPeriodYearThree_4F4719A330854960D71923BEECC8C2D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_8A88B52E3D043542D61223BEECC86BF0" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_8A88B52E3D043542D61223BEECC86BF0" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_CommonStockAggregatePurchasePriceIncludingCommission" xlink:label="loc_exls_CommonStockAggregatePurchasePriceIncludingCommission_E3343A88D8AAFBA5247B23BEECC8EC6E" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_exls_CommonStockAggregatePurchasePriceIncludingCommission_E3343A88D8AAFBA5247B23BEECC8EC6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_4D7A9DA1EEFD3E70DC8923BEECC8E21A" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_DAFFED1192AE89243FB723BEECC62C1B" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_4D7A9DA1EEFD3E70DC8923BEECC8E21A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedStatementsOfEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_B0A2F773700EA809725CD76F975BBEAD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_69C93149BC501028494DD76F975A7F2E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_B0A2F773700EA809725CD76F975BBEAD" xlink:to="loc_us-gaap_StatementTable_69C93149BC501028494DD76F975A7F2E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6A70399F7A3286B5AAE2D76F975AA712" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_69C93149BC501028494DD76F975A7F2E" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6A70399F7A3286B5AAE2D76F975AA712" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6A70399F7A3286B5AAE2D76F975AA712" xlink:to="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6A70399F7A3286B5AAE2D76F975AA712" xlink:to="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_315A13F7856DD9C3D6F6D76F975AAA02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_CommonStockMember_315A13F7856DD9C3D6F6D76F975AAA02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_CECF2AD37CCE55F805C1D76F975AB189" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_CECF2AD37CCE55F805C1D76F975AB189" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_1B388148C3594C6E585ED76F975A5AE7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_RetainedEarningsMember_1B388148C3594C6E585ED76F975A5AE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_14D0C36D021586408D75D76F975A1D4B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_14D0C36D021586408D75D76F975A1D4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_1F956106716173ACB814D76F975A0DE7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_TreasuryStockMember_1F956106716173ACB814D76F975A0DE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_12C5D8F75C00A5F5E390D76F975A2A56" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_21CCD7E1BB9682D1941AD76F975A926D" xlink:to="loc_us-gaap_NoncontrollingInterestMember_12C5D8F75C00A5F5E390D76F975A2A56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_B0A2F773700EA809725CD76F975BBEAD" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_A0311631763C2DAC1ECFD76F975B6DE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_A0311631763C2DAC1ECFD76F975B6DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_62AB6BA1BB0451CA0A33D76F975B0C36" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_62AB6BA1BB0451CA0A33D76F975B0C36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_BEAAF6C8F66E42BE9212D76F975BD88C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_BEAAF6C8F66E42BE9212D76F975BD88C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_2FFB7BFE1CB8CD933E4DD76F975BF63C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_2FFB7BFE1CB8CD933E4DD76F975BF63C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_CA80BB42A8EAE40C5A8BD76F975B41BC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_CA80BB42A8EAE40C5A8BD76F975B41BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" xlink:label="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_BD5EB11F90AD2C98BE50D76F975BEC60" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_BD5EB11F90AD2C98BE50D76F975BEC60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_4CE31CDDF5B0EFC4D746D76F975B428E" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_4CE31CDDF5B0EFC4D746D76F975B428E" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AcquisitionOfTreasuryStockValue" xlink:label="loc_exls_AcquisitionOfTreasuryStockValue_89501501CFF87D4F40C5D76F975BB707" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_exls_AcquisitionOfTreasuryStockValue_89501501CFF87D4F40C5D76F975BB707" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinorityInterestPeriodIncreaseDecrease" xlink:label="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_46AC5B5C6543475600DBD76F975B65F2" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_MinorityInterestPeriodIncreaseDecrease_46AC5B5C6543475600DBD76F975B65F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_D73946E8FD98E038C27BD76F975B7AE7" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_D73946E8FD98E038C27BD76F975B7AE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_3A4A10853D7DD6B1DAD6D76F975B4557" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_NetIncomeLoss_3A4A10853D7DD6B1DAD6D76F975B4557" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_DE0693390F2133D7E2C2D76F975B93CA" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_DE0693390F2133D7E2C2D76F975B93CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_654F3F8035695F01BB61D76F975B3949" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_2EF41681A66FA830666BD76F975B20CB" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1_654F3F8035695F01BB61D76F975B3949" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/ConsolidatedStatementsOfIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccounting" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccountingAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_75CC7823BD829B652F45D5A309A1D3F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_75CC7823BD829B652F45D5A309A1D3F3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_0410675BD7CC5B946F5CD5A309A158AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_75CC7823BD829B652F45D5A309A1D3F3" xlink:to="loc_us-gaap_HedgingDesignationAxis_0410675BD7CC5B946F5CD5A309A158AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_0410675BD7CC5B946F5CD5A309A158AE" xlink:to="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_0410675BD7CC5B946F5CD5A309A158AE" xlink:to="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_428CDADDE3E0AC3162FFD5A309A1C180" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_428CDADDE3E0AC3162FFD5A309A1C180" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_F9A7B98B53D0DFA21E3CD5A309A25DCB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ACCE6280D69D40DE4655D5A309A1B7FD" xlink:to="loc_us-gaap_NondesignatedMember_F9A7B98B53D0DFA21E3CD5A309A25DCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_61178DA2DE2E3BC38FD8D5A309A265EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_75CC7823BD829B652F45D5A309A1D3F3" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_61178DA2DE2E3BC38FD8D5A309A265EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_B9F63E27656D793B3EF0D5A309A2E184_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_61178DA2DE2E3BC38FD8D5A309A265EF" xlink:to="loc_us-gaap_HedgingRelationshipDomain_B9F63E27656D793B3EF0D5A309A2E184_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_B9F63E27656D793B3EF0D5A309A2E184" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_61178DA2DE2E3BC38FD8D5A309A265EF" xlink:to="loc_us-gaap_HedgingRelationshipDomain_B9F63E27656D793B3EF0D5A309A2E184" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_38304A30B6021637CD6ED5A309A2D74A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_B9F63E27656D793B3EF0D5A309A2E184" xlink:to="loc_us-gaap_CashFlowHedgingMember_38304A30B6021637CD6ED5A309A2D74A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_36F8CA75CF7B12F6E116D5A309A22002" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_75CC7823BD829B652F45D5A309A1D3F3" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_36F8CA75CF7B12F6E116D5A309A22002" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1685CEE416C8D42508DAD5A309A29BDD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_36F8CA75CF7B12F6E116D5A309A22002" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1685CEE416C8D42508DAD5A309A29BDD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1685CEE416C8D42508DAD5A309A29BDD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_36F8CA75CF7B12F6E116D5A309A22002" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1685CEE416C8D42508DAD5A309A29BDD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_D9F2213972971756ED2DD5A309A23861" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1685CEE416C8D42508DAD5A309A29BDD" xlink:to="loc_us-gaap_ForeignExchangeContractMember_D9F2213972971756ED2DD5A309A23861" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_7E2656E6498B47ED5DAED5A309A23837" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:to="loc_invest_DerivativeNotionalAmount_7E2656E6498B47ED5DAED5A309A23837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_BCCE547F2AF4020B49C9D5A309A78C4D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_BCCE547F2AF4020B49C9D5A309A78C4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumLengthOfTimeHedgedInCashFlowHedge1" xlink:label="loc_us-gaap_MaximumLengthOfTimeHedgedInCashFlowHedge1_CC230459D1433B343DD7D5A309A78FC4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:to="loc_us-gaap_MaximumLengthOfTimeHedgedInCashFlowHedge1_CC230459D1433B343DD7D5A309A78FC4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet" xlink:label="loc_us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet_5FC8151BA7DA16523277D5A309A791EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_2AF0540BBCC027EC9287D5A309A216AC" xlink:to="loc_us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet_5FC8151BA7DA16523277D5A309A791EB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccountingDerivativesAndHedgeAccountingLocationOfGainOrLossRecognizedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_1EA5B676FE984E242B53D76F96855BFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_1EA5B676FE984E242B53D76F96855BFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_82E5BA1FE014069A8CBAD76F968505E1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_1EA5B676FE984E242B53D76F96855BFE" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_82E5BA1FE014069A8CBAD76F968505E1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_82E5BA1FE014069A8CBAD76F968505E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_1EA5B676FE984E242B53D76F96855BFE" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_82E5BA1FE014069A8CBAD76F968505E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_660D151CEE557D94E192D76F96856BA0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_82E5BA1FE014069A8CBAD76F968505E1" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_660D151CEE557D94E192D76F96856BA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_6461BBFE17ADE5C169EDD76F9685609A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:to="loc_us-gaap_HedgingDesignationAxis_6461BBFE17ADE5C169EDD76F9685609A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_FECA4B3C6F3066111693D76F96855B5B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_6461BBFE17ADE5C169EDD76F9685609A" xlink:to="loc_us-gaap_HedgingDesignationDomain_FECA4B3C6F3066111693D76F96855B5B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_FECA4B3C6F3066111693D76F96855B5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_6461BBFE17ADE5C169EDD76F9685609A" xlink:to="loc_us-gaap_HedgingDesignationDomain_FECA4B3C6F3066111693D76F96855B5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_35DF46C322F426C92998D76F9685E0E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_FECA4B3C6F3066111693D76F96855B5B" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_35DF46C322F426C92998D76F9685E0E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_9161E6D3AC53FF375B90D76F96850ACD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_9161E6D3AC53FF375B90D76F96850ACD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_9161E6D3AC53FF375B90D76F96850ACD" xlink:to="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_9161E6D3AC53FF375B90D76F96850ACD" xlink:to="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_72FDC3155418582D511CD76F968576C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1" xlink:to="loc_us-gaap_CashFlowHedgingMember_72FDC3155418582D511CD76F968576C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueHedgingMember" xlink:label="loc_us-gaap_FairValueHedgingMember_3BE0E741DB748C70D656D76F9685EF6B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_67ED245D5E6ADDDA896AD76F9685B4C1" xlink:to="loc_us-gaap_FairValueHedgingMember_3BE0E741DB748C70D656D76F9685EF6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8B17A7DEDD741A872A10D76F9685B3DD" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_40ABAC4B338E972A51ADD76F9685BF3B" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8B17A7DEDD741A872A10D76F9685B3DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1A15BFF7D7ABE3374172D76F96856191_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8B17A7DEDD741A872A10D76F9685B3DD" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1A15BFF7D7ABE3374172D76F96856191_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1A15BFF7D7ABE3374172D76F96856191" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8B17A7DEDD741A872A10D76F9685B3DD" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1A15BFF7D7ABE3374172D76F96856191" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_8EE88E9E6195C0E548DCD76F96859B06" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_1A15BFF7D7ABE3374172D76F96856191" xlink:to="loc_us-gaap_ForeignExchangeContractMember_8EE88E9E6195C0E548DCD76F96859B06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServices" xlink:label="loc_us-gaap_CostOfServices_9BB5130F04711B5A7712D76F968600B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_CostOfServices_9BB5130F04711B5A7712D76F968600B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_26556023BFF75A1AFFB5D76F96869210" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_26556023BFF75A1AFFB5D76F96869210" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_2FA4B8D317D12F202522D76F9686B747" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_SellingAndMarketingExpense_2FA4B8D317D12F202522D76F9686B747" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_us-gaap_DepreciationAndAmortization_F891F22DDEBB263C18D8D76F96863E68" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_DepreciationAndAmortization_F891F22DDEBB263C18D8D76F96863E68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_4F232EC7F711047E3242D76F968667BC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_4F232EC7F711047E3242D76F968667BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_25FD0C4A974CCA2C464AD76F968668E1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3155C9F323ECEEA23F2CD76F96869C3F" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_25FD0C4A974CCA2C464AD76F968668E1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccountingSummaryOfEffectOfForeignCurrencyExchangeContractsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0DDA9F0DD8268C45C8E6D5A3098517D9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1C87D78917CA53F66FFCD5A3098402FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0DDA9F0DD8268C45C8E6D5A3098517D9" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1C87D78917CA53F66FFCD5A3098402FA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_D67C4CB83DD1B9D585B4D5A30984956E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1C87D78917CA53F66FFCD5A3098402FA" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_D67C4CB83DD1B9D585B4D5A30984956E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_D67C4CB83DD1B9D585B4D5A30984956E" xlink:to="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_D67C4CB83DD1B9D585B4D5A30984956E" xlink:to="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_5CE3B2D9A5A84712A72CD5A30984D519" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6" xlink:to="loc_us-gaap_CashFlowHedgingMember_5CE3B2D9A5A84712A72CD5A30984D519" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueHedgingMember" xlink:label="loc_us-gaap_FairValueHedgingMember_10623D472BD71379767ED5A30984214F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_292AA3E4D01F277843C2D5A30984CAC6" xlink:to="loc_us-gaap_FairValueHedgingMember_10623D472BD71379767ED5A30984214F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_30A1F0A26C1B26324FE2D5A309847E6E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1C87D78917CA53F66FFCD5A3098402FA" xlink:to="loc_us-gaap_HedgingDesignationAxis_30A1F0A26C1B26324FE2D5A309847E6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_F3CA852896787B53A9DBD5A309842273_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_30A1F0A26C1B26324FE2D5A309847E6E" xlink:to="loc_us-gaap_HedgingDesignationDomain_F3CA852896787B53A9DBD5A309842273_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_F3CA852896787B53A9DBD5A309842273" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_30A1F0A26C1B26324FE2D5A309847E6E" xlink:to="loc_us-gaap_HedgingDesignationDomain_F3CA852896787B53A9DBD5A309842273" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2BE14B60A3F7777EDB9DD5A3098471DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_F3CA852896787B53A9DBD5A309842273" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2BE14B60A3F7777EDB9DD5A3098471DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_4BA97F1F3F697A54A64BD5A30985CDDC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_1C87D78917CA53F66FFCD5A3098402FA" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_4BA97F1F3F697A54A64BD5A30985CDDC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_27C19D1E25EFAE7F94DAD5A3098576AA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4BA97F1F3F697A54A64BD5A30985CDDC" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_27C19D1E25EFAE7F94DAD5A3098576AA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_27C19D1E25EFAE7F94DAD5A3098576AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4BA97F1F3F697A54A64BD5A30985CDDC" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_27C19D1E25EFAE7F94DAD5A3098576AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_BB4FEA3700A379E4F5DED5A30985D9A4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_27C19D1E25EFAE7F94DAD5A3098576AA" xlink:to="loc_us-gaap_ForeignExchangeContractMember_BB4FEA3700A379E4F5DED5A30985D9A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet_43A97C02DDB78EFCCD90D5A309855214" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0DDA9F0DD8268C45C8E6D5A3098517D9" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet_43A97C02DDB78EFCCD90D5A309855214" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_67EA273028EA8CBCD4E2D5A30985CA60" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_0DDA9F0DD8268C45C8E6D5A3098517D9" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_67EA273028EA8CBCD4E2D5A30985CA60" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccountingSummaryOfFairValueOfForeignCurrencyExchangeContractsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_D7D0C632C157C3D45310D5A30999524A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_AA0E3FA6D6B89F6C0E3ED5A30992BD1A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_D7D0C632C157C3D45310D5A30999524A" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_AA0E3FA6D6B89F6C0E3ED5A30992BD1A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_1D5C2914ED3798F526FCD5A3099390BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_AA0E3FA6D6B89F6C0E3ED5A30992BD1A" xlink:to="loc_us-gaap_HedgingDesignationAxis_1D5C2914ED3798F526FCD5A3099390BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_1D5C2914ED3798F526FCD5A3099390BF" xlink:to="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_1D5C2914ED3798F526FCD5A3099390BF" xlink:to="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_15F90F43FF1D46D50675D5A309938F1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_15F90F43FF1D46D50675D5A309938F1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_AA9317DB41CE339320BCD5A309930717" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_A9B34C164D74C117808ED5A309936551" xlink:to="loc_us-gaap_NondesignatedMember_AA9317DB41CE339320BCD5A309930717" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_88FA30EDCF50848BCD8DD5A30993B01B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_AA0E3FA6D6B89F6C0E3ED5A30992BD1A" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_88FA30EDCF50848BCD8DD5A30993B01B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_88FA30EDCF50848BCD8DD5A30993B01B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_88FA30EDCF50848BCD8DD5A30993B01B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherCurrentAssetsMember" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_759E72ACCA1A303627D0D5A30993E267" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_759E72ACCA1A303627D0D5A30993E267" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherAssetsMember" xlink:label="loc_us-gaap_OtherAssetsMember_5F43A5CDF89BCBC8B1EFD5A30993590F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:to="loc_us-gaap_OtherAssetsMember_5F43A5CDF89BCBC8B1EFD5A30993590F" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AccruedExpensesAndOtherCurrentLiabilitiesMember" xlink:label="loc_exls_AccruedExpensesAndOtherCurrentLiabilitiesMember_F103C0F6A5A1BED3AEEDD5A309939195" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:to="loc_exls_AccruedExpensesAndOtherCurrentLiabilitiesMember_F103C0F6A5A1BED3AEEDD5A309939195" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesMember" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_3B8EE24761C0AEB2CEDBD5A30993FD48" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_2941013984064F97F8E0D5A309935319" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_3B8EE24761C0AEB2CEDBD5A30993FD48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_285A3B4A382C45C716FFD5A30993502C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_AA0E3FA6D6B89F6C0E3ED5A30992BD1A" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_285A3B4A382C45C716FFD5A30993502C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_FED39B26051D2A0E281BD5A30993A5DF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_285A3B4A382C45C716FFD5A30993502C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_FED39B26051D2A0E281BD5A30993A5DF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_FED39B26051D2A0E281BD5A30993A5DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_285A3B4A382C45C716FFD5A30993502C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_FED39B26051D2A0E281BD5A30993A5DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_153960BA61E93DDF274AD5A309985C5D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_FED39B26051D2A0E281BD5A30993A5DF" xlink:to="loc_us-gaap_ForeignExchangeContractMember_153960BA61E93DDF274AD5A309985C5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_9D4097F61CD03CB63201D5A3099901E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_D7D0C632C157C3D45310D5A30999524A" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_9D4097F61CD03CB63201D5A3099901E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_86F05CAA4FCDB3033ACED5A3099941D1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_D7D0C632C157C3D45310D5A30999524A" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_86F05CAA4FCDB3033ACED5A3099941D1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DerivativesAndHedgeAccountingTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EarningsPerShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EarningsPerShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlans" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansAdditionalInformationDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansChangeInPlanAssetsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansNetGratuityCostDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfChangeInProjectedBenefitObligationDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfComponentsAccumulatedOtherComprehensiveLossDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfExpectedBenefitPaymentsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansSummaryOfWeightedAverageActuarialAssumptionsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/EmployeeBenefitPlansTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_907CAF8AA953E5FB1C187BCB781A6907" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4609C47E68A589A5FF837BCB7819E72A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_907CAF8AA953E5FB1C187BCB781A6907" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4609C47E68A589A5FF837BCB7819E72A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_234117BF99AC2F298DF37BCB7819807C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4609C47E68A589A5FF837BCB7819E72A" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_234117BF99AC2F298DF37BCB7819807C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_234117BF99AC2F298DF37BCB7819807C" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_234117BF99AC2F298DF37BCB7819807C" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_C68AD5AB9CBAFE5F7A227BCB781A3CA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_C68AD5AB9CBAFE5F7A227BCB781A3CA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_12425CDE9C2275DC92A97BCB781AB87B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_12425CDE9C2275DC92A97BCB781AB87B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_F82563C3B03CE9F3B96F7BCB781AB42E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8B4322A0176B1E0087607BCB781A7D6D" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_F82563C3B03CE9F3B96F7BCB781AB42E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_73498C4B856B5F92AB9F7BCB781AA9AC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_4609C47E68A589A5FF837BCB7819E72A" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_73498C4B856B5F92AB9F7BCB781AA9AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_D129BF181489159ADCDC7BCB781ADDD0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_73498C4B856B5F92AB9F7BCB781AA9AC" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_D129BF181489159ADCDC7BCB781ADDD0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_D129BF181489159ADCDC7BCB781ADDD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_73498C4B856B5F92AB9F7BCB781AA9AC" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_D129BF181489159ADCDC7BCB781ADDD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_A39280D398A1B195C4397BCB781ACC59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_D129BF181489159ADCDC7BCB781ADDD0" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_A39280D398A1B195C4397BCB781ACC59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_8D2CF0A349BD8DDF91067BCB781A5EEE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_907CAF8AA953E5FB1C187BCB781A6907" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_8D2CF0A349BD8DDF91067BCB781A5EEE" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_MoneyMarketAndMutualFundFairValueDisclosure" xlink:label="loc_exls_MoneyMarketAndMutualFundFairValueDisclosure_381263ABBC3D5795842C7BCB781A0C6A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_8D2CF0A349BD8DDF91067BCB781A5EEE" xlink:to="loc_exls_MoneyMarketAndMutualFundFairValueDisclosure_381263ABBC3D5795842C7BCB781A0C6A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_13592F3FF1BD31FC10297BCB781AEA65" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_8D2CF0A349BD8DDF91067BCB781A5EEE" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_13592F3FF1BD31FC10297BCB781AEA65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_D03733CC73A192E6DD1C7BCB781A2D6D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_8D2CF0A349BD8DDF91067BCB781A5EEE" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_D03733CC73A192E6DD1C7BCB781A2D6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_683DD00BA895B35F1DB07BCB781A71CA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_907CAF8AA953E5FB1C187BCB781A6907" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_683DD00BA895B35F1DB07BCB781A71CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_39D886803411E4C32F8D7BCB781AD793" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_683DD00BA895B35F1DB07BCB781A71CA" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_39D886803411E4C32F8D7BCB781AD793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NonfinancialLiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_NonfinancialLiabilitiesFairValueDisclosure_0FD755B1F8458E99F2437BE4113C6C0E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_683DD00BA895B35F1DB07BCB781A71CA" xlink:to="loc_us-gaap_NonfinancialLiabilitiesFairValueDisclosure_0FD755B1F8458E99F2437BE4113C6C0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_E864C20C5AC9854AFD507BCB781B845E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_683DD00BA895B35F1DB07BCB781A71CA" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_E864C20C5AC9854AFD507BCB781B845E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="exls-20171231.xsd#exls_IncomeTaxesLineItems" xlink:label="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:type="locator" />
    <link:loc xlink:href="exls-20171231.xsd#exls_IncomeTaxesTable" xlink:label="loc_exls_IncomeTaxesTable_585A7462781F4A967942C89C05FB6659" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_IncomeTaxesTable_585A7462781F4A967942C89C05FB6659" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TaxPeriodAxis" xlink:label="loc_us-gaap_TaxPeriodAxis_28385E6054C9A666686EC89C05FBBF67" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_exls_IncomeTaxesTable_585A7462781F4A967942C89C05FB6659" xlink:to="loc_us-gaap_TaxPeriodAxis_28385E6054C9A666686EC89C05FBBF67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TaxPeriodDomain" xlink:label="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_28385E6054C9A666686EC89C05FBBF67" xlink:to="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TaxPeriodDomain" xlink:label="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_28385E6054C9A666686EC89C05FBBF67" xlink:to="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_FirstFiveYearsMember" xlink:label="loc_exls_FirstFiveYearsMember_DA0CDDE346C7A3740062C89C05FB60ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B" xlink:to="loc_exls_FirstFiveYearsMember_DA0CDDE346C7A3740062C89C05FB60ED" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_FiveToTenYearsMember" xlink:label="loc_exls_FiveToTenYearsMember_013FEE31B7FBE2D71783C89C05FB4A14" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B" xlink:to="loc_exls_FiveToTenYearsMember_013FEE31B7FBE2D71783C89C05FB4A14" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ExpirationDateTwoThousandAndThirtyTwoMember" xlink:label="loc_exls_ExpirationDateTwoThousandAndThirtyTwoMember_5777FE70D47EAA52736BC89C05FB18FE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_C8C1374C905170E19971C89C05FBF93B" xlink:to="loc_exls_ExpirationDateTwoThousandAndThirtyTwoMember_5777FE70D47EAA52736BC89C05FB18FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_57575D78A21F3BBB1E78C89C05FBF083" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_57575D78A21F3BBB1E78C89C05FBF083" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit" xlink:label="loc_exls_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit_01FA819008CEB264A643C89C05FC6E13" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit_01FA819008CEB264A643C89C05FC6E13" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiability" xlink:label="loc_exls_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiability_EC381DB5AD58CFF3A4CDC89C05FC0DD8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiability_EC381DB5AD58CFF3A4CDC89C05FC0DD8" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount" xlink:label="loc_exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount_95EFC776F559ABA55EE2C89C05FCA39D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount_95EFC776F559ABA55EE2C89C05FCA39D" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_NumberOfOperationCentersIncomeTaxHolidayExpired" xlink:label="loc_exls_NumberOfOperationCentersIncomeTaxHolidayExpired_A1BFC26A46072BF3BEACC89C05FC0015" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_NumberOfOperationCentersIncomeTaxHolidayExpired_A1BFC26A46072BF3BEACC89C05FC0015" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_EffectiveIncomeTaxRateReconciliationForeignFlatIncomeTaxRate" xlink:label="loc_exls_EffectiveIncomeTaxRateReconciliationForeignFlatIncomeTaxRate_CC664F41BAC02CC470ECC89C05FCCC6E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_EffectiveIncomeTaxRateReconciliationForeignFlatIncomeTaxRate_CC664F41BAC02CC470ECC89C05FCCC6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_B8E4E11F6385B0836168C89C05FC1A63" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_B8E4E11F6385B0836168C89C05FC1A63" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_EffectOnDilutedEarningsPerShareTaxHoliday" xlink:label="loc_exls_EffectOnDilutedEarningsPerShareTaxHoliday_9FF9E995F5A0A2D9AC56C89C05FC2E69" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_EffectOnDilutedEarningsPerShareTaxHoliday_9FF9E995F5A0A2D9AC56C89C05FC2E69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance" xlink:label="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_36A36D56F7C8F37476C1C89C05FC7FE8" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_36A36D56F7C8F37476C1C89C05FC7FE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance" xlink:label="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_4061C63930D97970B6B7C89C05FCBEB8" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_4061C63930D97970B6B7C89C05FCBEB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="loc_us-gaap_OperatingLossCarryforwards_7BA32EDDD04BC25D7308C89C05FCE829" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_OperatingLossCarryforwards_7BA32EDDD04BC25D7308C89C05FCE829" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_OperatingLossCarryforwardsExpirationYear" xlink:label="loc_exls_OperatingLossCarryforwardsExpirationYear_71F70CB082328C26E8B4C89C05FCC11E" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_exls_OperatingLossCarryforwardsExpirationYear_71F70CB082328C26E8B4C89C05FCC11E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_1B27317D4E7961D2CE9CC89C05FCE6D7" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_1B27317D4E7961D2CE9CC89C05FCE6D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UndistributedEarningsOfForeignSubsidiaries" xlink:label="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_11F15C2415CB67BDA4F8C89C05FCE35D" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_11F15C2415CB67BDA4F8C89C05FCE35D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_4248C71DD7686A19131DC89C05FCDD73" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_4248C71DD7686A19131DC89C05FCDD73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense" xlink:label="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense_79963FAFD9BC33A970F9C89C05FC4C21" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense_79963FAFD9BC33A970F9C89C05FC4C21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_ED8AB645AC43FF717D85C89C05FCF142" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_exls_IncomeTaxesLineItems_7900EEA38EB0E25D40EDC89C05FB9717" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_ED8AB645AC43FF717D85C89C05FCF142" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesSummaryOfActivityRelatedToGrossUnrecognizedTaxBenefitsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesSummaryOfComponentsOfDeferredTaxBalancesDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesSummaryOfComponentsOfIncomeBeforeIncomeTaxesDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesSummaryOfEffectiveIncomeTaxRateDiffersFromAmountComputedByApplyingUSFederalStatutoryIncomeTaxRateToIncomeBeforeIncomeTaxesDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesSummaryOfIncomeTaxExpenseDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/InvestmentInEquityAffiliate" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/InvestmentInEquityAffiliateDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_BEEEC96A751CF86D3C02D76F96E9FCFD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3F7AA64047B61AA1B2AAD76F96E93E89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_BEEEC96A751CF86D3C02D76F96E9FCFD" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3F7AA64047B61AA1B2AAD76F96E93E89" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_9432FA16C4470E37A88CD76F96E95FA2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_3F7AA64047B61AA1B2AAD76F96E93E89" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_9432FA16C4470E37A88CD76F96E95FA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_501992B2BE913503965FD76F96E9117D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_9432FA16C4470E37A88CD76F96E95FA2" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_501992B2BE913503965FD76F96E9117D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="loc_us-gaap_EquityMethodInvesteeNameDomain_501992B2BE913503965FD76F96E9117D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_9432FA16C4470E37A88CD76F96E95FA2" xlink:to="loc_us-gaap_EquityMethodInvesteeNameDomain_501992B2BE913503965FD76F96E9117D" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_CorridorPlatformIncMember" xlink:label="loc_exls_CorridorPlatformIncMember_E2EC5D32359DF1E87603D76F96E9C03A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvesteeNameDomain_501992B2BE913503965FD76F96E9117D" xlink:to="loc_exls_CorridorPlatformIncMember_E2EC5D32359DF1E87603D76F96E9C03A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_FB15973CEFC41B0A9D57D76F96EAF06E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_BEEEC96A751CF86D3C02D76F96E9FCFD" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_FB15973CEFC41B0A9D57D76F96EAF06E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/Leases" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/LeasesFutureMinimumLeasePaymentsUnderCapitalLeasesDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/LeasesFutureMinimumLeasePaymentsUnderNonCancelableOperatingLeaseAgreementsExpiringAfterDecember312016Detail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/LeasesRentExpenseAndDeferredRentDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/NatureOfOperationAndOrganization" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/NonCurrentLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/NonCurrentLiabilitiesSummaryOfNonCurrentLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/NonCurrentLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherCurrentAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherCurrentAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherCurrentAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherIncomeNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherIncomeNetSummaryOfOtherIncomeNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/OtherIncomeNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/PropertyAndEquipment" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/PropertyAndEquipmentDepreciationAndAmortizationExpenseDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_21A5B567A34DB3ED5B9C8C2285A75737" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3530944C7DFE7871D70D8C2285A55608" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_21A5B567A34DB3ED5B9C8C2285A75737" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3530944C7DFE7871D70D8C2285A55608" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_5703F8BFF7E69EC37C0E8C22867E39D5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_3530944C7DFE7871D70D8C2285A55608" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_5703F8BFF7E69EC37C0E8C22867E39D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6BBE4DD9E23845029D9A8C22867E3483_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5703F8BFF7E69EC37C0E8C22867E39D5" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6BBE4DD9E23845029D9A8C22867E3483_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6BBE4DD9E23845029D9A8C22867E3483" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_5703F8BFF7E69EC37C0E8C22867E39D5" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6BBE4DD9E23845029D9A8C22867E3483" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_DepreciationAndAmortizationMember" xlink:label="loc_exls_DepreciationAndAmortizationMember_F32449DF22ABF63B33BD8C2286B210BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6BBE4DD9E23845029D9A8C22867E3483" xlink:to="loc_exls_DepreciationAndAmortizationMember_F32449DF22ABF63B33BD8C2286B210BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_0DD5A9F53D2909D793458C22862C0499" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_21A5B567A34DB3ED5B9C8C2285A75737" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_0DD5A9F53D2909D793458C22862C0499" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/PropertyAndEquipmentPropertyAndEquipmentInternallyDevelopedSoftwareCostsIncludedUnderSoftwareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/PropertyAndEquipmentScheduleOfPropertyAndEquipmentDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_970DB1EEBBD47236E172C89C068EADEC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_E583913FC944DB95F328C89C068D567A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_970DB1EEBBD47236E172C89C068EADEC" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_E583913FC944DB95F328C89C068D567A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_F53349AAAAF550171751C89C068DDA68" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_E583913FC944DB95F328C89C068D567A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_F53349AAAAF550171751C89C068DDA68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_F53349AAAAF550171751C89C068DDA68" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_F53349AAAAF550171751C89C068DDA68" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TechnologyEquipmentMember" xlink:label="loc_us-gaap_TechnologyEquipmentMember_78C52727F70150D9BC6CC89C068DBEDF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_TechnologyEquipmentMember_78C52727F70150D9BC6CC89C068DBEDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_E335D3C5A4F69C4AD189C89C068D7B23" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_E335D3C5A4F69C4AD189C89C068D7B23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_C10C3E75CA0149CACE58C89C068D2CED" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_C10C3E75CA0149CACE58C89C068D2CED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_E965C2207AAB3E96640BC89C068E9C60" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_E965C2207AAB3E96640BC89C068E9C60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_931174FD741512FBBE47C89C068E8B8E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_VehiclesMember_931174FD741512FBBE47C89C068E8B8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_774305127A5CDC5FEFAAC89C068E2CCE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_BuildingMember_774305127A5CDC5FEFAAC89C068E2CCE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LandMember" xlink:label="loc_us-gaap_LandMember_BC2567BC5E0C8040F9B2C89C068E068D" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_LandMember_BC2567BC5E0C8040F9B2C89C068E068D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ConstructionInProgressMember" xlink:label="loc_us-gaap_ConstructionInProgressMember_A97C63B144AD50A22D31C89C068E3C84" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_83BBD7171989CBEABBA6C89C068D6D78" xlink:to="loc_us-gaap_ConstructionInProgressMember_A97C63B144AD50A22D31C89C068E3C84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_F886219EEC766DBCE41EC89C068E72B2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_E583913FC944DB95F328C89C068D567A" xlink:to="loc_us-gaap_RangeAxis_F886219EEC766DBCE41EC89C068E72B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_F886219EEC766DBCE41EC89C068E72B2" xlink:to="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_F886219EEC766DBCE41EC89C068E72B2" xlink:to="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_7151F6A81D88BA1F465AC89C068ED1F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D" xlink:to="loc_us-gaap_MinimumMember_7151F6A81D88BA1F465AC89C068ED1F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_B17C428E7E569082F10BC89C068EA390" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_2B0A7F9FB10996D08B34C89C068E135D" xlink:to="loc_us-gaap_MaximumMember_B17C428E7E569082F10BC89C068EA390" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_970DB1EEBBD47236E172C89C068EADEC" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_0B21AB7FA0128C978D02C89C068E15EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_0B21AB7FA0128C978D02C89C068E15EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGrossExcludingCapitalLeasedAssets" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGrossExcludingCapitalLeasedAssets_89C70F9BC5B8785BBDCEC89C068E829F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGrossExcludingCapitalLeasedAssets_89C70F9BC5B8785BBDCEC89C068E829F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets_FA3015C59FA624B7AFBFC89C068E8E72" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets_FA3015C59FA624B7AFBFC89C068E8E72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets_2AA681C6F2AE193DD7B2C89C068E12AC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssetsAbstract_BB8DD8CCE1540B31A543C89C068E5D59" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets_2AA681C6F2AE193DD7B2C89C068E12AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract" xlink:label="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract_83F45C4E6EAE9E5470E6C89C068E6D7D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_970DB1EEBBD47236E172C89C068EADEC" xlink:to="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract_83F45C4E6EAE9E5470E6C89C068E6D7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasedAssetsGross" xlink:label="loc_us-gaap_CapitalLeasedAssetsGross_FF7EB49374D77A9901A2C89C068EB042" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract_83F45C4E6EAE9E5470E6C89C068E6D7D" xlink:to="loc_us-gaap_CapitalLeasedAssetsGross_FF7EB49374D77A9901A2C89C068EB042" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation" xlink:label="loc_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_0ACA4ACBB9B6D5C6B1E7C89C068EEED3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract_83F45C4E6EAE9E5470E6C89C068E6D7D" xlink:to="loc_us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation_0ACA4ACBB9B6D5C6B1E7C89C068EEED3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet" xlink:label="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet_32BB8420915D9DC1810FC89C068E15E2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNetLesseeBalanceSheetAbstract_83F45C4E6EAE9E5470E6C89C068E6D7D" xlink:to="loc_us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet_32BB8420915D9DC1810FC89C068E15E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_590F011A8B467DFC3CA9C89C068EE2A2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_970DB1EEBBD47236E172C89C068EADEC" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_590F011A8B467DFC3CA9C89C068EE2A2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/PropertyAndEquipmentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/QuarterlyFinancialDataUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/QuarterlyFinancialDataUnauditedSummaryOfQuarterlyResultsDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/QuarterlyFinancialDataUnauditedTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/RelatedPartyDisclosures" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/RelatedPartyDisclosuresDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SegmentGeographicalInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SegmentGeographicalInformationAdditionalInformationDetail" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SegmentGeographicalInformationRevenuesAndCostOfRevenuesForCompanysReportableSegmentsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_5494E7251D222618BDB7786E32F13B56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_5494E7251D222618BDB7786E32F13B56" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_BA7641ED39C26539FDF9786E32F2B2E5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_5494E7251D222618BDB7786E32F13B56" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_BA7641ED39C26539FDF9786E32F2B2E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_BA7641ED39C26539FDF9786E32F2B2E5" xlink:to="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_BA7641ED39C26539FDF9786E32F2B2E5" xlink:to="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_InsuranceMember" xlink:label="loc_exls_InsuranceMember_C8297DC1EB257FF51811786E32F2B705" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_InsuranceMember_C8297DC1EB257FF51811786E32F2B705" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_HealthcareMember" xlink:label="loc_exls_HealthcareMember_A894222E10931AFBCEDE786E32F20FB9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_HealthcareMember_A894222E10931AFBCEDE786E32F20FB9" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TravelTransportationandLogisticsMember" xlink:label="loc_exls_TravelTransportationandLogisticsMember_8295D23CAD7AB4168154786E32F2502C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_TravelTransportationandLogisticsMember_8295D23CAD7AB4168154786E32F2502C" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_FinanceandAccountingMember" xlink:label="loc_exls_FinanceandAccountingMember_B1939AB4BAB5C3207503786E32F2BFDC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_FinanceandAccountingMember_B1939AB4BAB5C3207503786E32F2BFDC" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_OtherOperationsManagementMember" xlink:label="loc_exls_OtherOperationsManagementMember_727838B98BD5E9C46F9C786E32F282D5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_OtherOperationsManagementMember_727838B98BD5E9C46F9C786E32F282D5" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AnalyticsMember" xlink:label="loc_exls_AnalyticsMember_3C7C4A284FFDF76BD3E6788F6AE751DC" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_C567773C4013DEE4DFAF786E32F2E403" xlink:to="loc_exls_AnalyticsMember_3C7C4A284FFDF76BD3E6788F6AE751DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProductOrServiceAxis" xlink:label="loc_us-gaap_ProductOrServiceAxis_D06770752BC40BE7A44E786E32F257EE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_5494E7251D222618BDB7786E32F13B56" xlink:to="loc_us-gaap_ProductOrServiceAxis_D06770752BC40BE7A44E786E32F257EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ProductOrServiceAxis_D06770752BC40BE7A44E786E32F257EE" xlink:to="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ProductsAndServicesDomain" xlink:label="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ProductOrServiceAxis_D06770752BC40BE7A44E786E32F257EE" xlink:to="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_BPMandRelatedServicesMember" xlink:label="loc_exls_BPMandRelatedServicesMember_1E121EC9738DD3981FE7786E32F2D93B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5" xlink:to="loc_exls_BPMandRelatedServicesMember_1E121EC9738DD3981FE7786E32F2D93B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AnalyticsServicesMember" xlink:label="loc_exls_AnalyticsServicesMember_A7F59EE6D0BC84D4299E786E32F23352" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProductsAndServicesDomain_92372FE2BB79887D04C2786E32F20BD5" xlink:to="loc_exls_AnalyticsServicesMember_A7F59EE6D0BC84D4299E786E32F23352" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_82E0AD7A2EC855AB0A57786E32F2D860" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_SalesRevenueServicesNet_82E0AD7A2EC855AB0A57786E32F2D860" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization_1F2832BF93D92476EDF2786E32F238C3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_CostOfServicesExcludingDepreciationDepletionAndAmortization_1F2832BF93D92476EDF2786E32F238C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_B1A55E5FAD5877469FB9786E32F22A28" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_GrossProfit_B1A55E5FAD5877469FB9786E32F22A28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_A826899EBC5CFC726BB7786E32F3EBB9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_OperatingExpenses_A826899EBC5CFC726BB7786E32F3EBB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_91302390DF314EC8261A786E32F36000" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_91302390DF314EC8261A786E32F36000" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_44DFA8AC3783A7A1D54F786E32F3C2F2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_44DFA8AC3783A7A1D54F786E32F3C2F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_B14CAB12AEDB2D822553786E32F30B01" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_us-gaap_NetIncomeLoss_B14CAB12AEDB2D822553786E32F30B01" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_NumberofOperatingSegmentsIndustryFocused" xlink:label="loc_exls_NumberofOperatingSegmentsIndustryFocused_1CB7037A23111F1514C6786E32F36A6E" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_exls_NumberofOperatingSegmentsIndustryFocused_1CB7037A23111F1514C6786E32F36A6E" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_NumberofOperatingSegmentsFinanceandAccountingServices" xlink:label="loc_exls_NumberofOperatingSegmentsFinanceandAccountingServices_E32C18876FDA173821F8786E32F32695" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_7DE914567909AB9C29C1786E32F23CCF" xlink:to="loc_exls_NumberofOperatingSegmentsFinanceandAccountingServices_E32C18876FDA173821F8786E32F32695" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SegmentGeographicalInformationRevenuesAndPropertyAndEquipmentNetBasedOnGeographicalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_1756C92A13EAB8D3758DD76F9726670E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_A3C5D7F992C79C97F242D76F9725A16B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_1756C92A13EAB8D3758DD76F9726670E" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_A3C5D7F992C79C97F242D76F9725A16B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_86F12BF16699ADCFDAC6D76F972524B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_A3C5D7F992C79C97F242D76F9725A16B" xlink:to="loc_us-gaap_StatementGeographicalAxis_86F12BF16699ADCFDAC6D76F972524B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_86F12BF16699ADCFDAC6D76F972524B4" xlink:to="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_86F12BF16699ADCFDAC6D76F972524B4" xlink:to="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_US" xlink:label="loc_country_US_7CFE034B35B95C97A9EFD76F97257F9A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_country_US_7CFE034B35B95C97A9EFD76F97257F9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_GB" xlink:label="loc_country_GB_D15FD1165CC0FB73FB7FD76F97267123" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_country_GB_D15FD1165CC0FB73FB7FD76F97267123" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RestOfWorldMember" xlink:label="loc_exls_RestOfWorldMember_575CFD8D414BE7D7D1E6D76F97264A76" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_exls_RestOfWorldMember_575CFD8D414BE7D7D1E6D76F97264A76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NonUsMember" xlink:label="loc_us-gaap_NonUsMember_5E06711B2ED120550861D76F97261A08" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_us-gaap_NonUsMember_5E06711B2ED120550861D76F97261A08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_IN" xlink:label="loc_country_IN_3D10472EEFE451B0AFBBD76F9726D2FF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_country_IN_3D10472EEFE451B0AFBBD76F9726D2FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd#country_PH" xlink:label="loc_country_PH_FD703DEDFE6D1D111D10D76F97269D7D" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_EFA9B03AC2D5EB49BD4FD76F9725CFBD" xlink:to="loc_country_PH_FD703DEDFE6D1D111D10D76F97269D7D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_8F88EFEEDD7303C0CED4D76F972616DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_1756C92A13EAB8D3758DD76F9726670E" xlink:to="loc_us-gaap_RevenuesAbstract_8F88EFEEDD7303C0CED4D76F972616DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_878C5362B60286F9DB02D76F9726431C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_8F88EFEEDD7303C0CED4D76F972616DB" xlink:to="loc_us-gaap_SalesRevenueServicesNet_878C5362B60286F9DB02D76F9726431C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_433EEDBC3E2A1EE3681BD76F9726DD4D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_1756C92A13EAB8D3758DD76F9726670E" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_433EEDBC3E2A1EE3681BD76F9726DD4D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_0FAD2E8368E570FA202CD76F97260B96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_433EEDBC3E2A1EE3681BD76F9726DD4D" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_0FAD2E8368E570FA202CD76F97260B96" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SegmentGeographicalInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C9D40D6EB652B3ACEF71C89C05DF76A4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C9D40D6EB652B3ACEF71C89C05DF76A4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_FAE153AFA32793F2F953C8A4091261E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C9D40D6EB652B3ACEF71C89C05DF76A4" xlink:to="loc_us-gaap_PlanNameAxis_FAE153AFA32793F2F953C8A4091261E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_01E69B1D5D3D359E0DD7C8A409151E38_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_FAE153AFA32793F2F953C8A4091261E8" xlink:to="loc_us-gaap_PlanNameDomain_01E69B1D5D3D359E0DD7C8A409151E38_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_01E69B1D5D3D359E0DD7C8A409151E38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_FAE153AFA32793F2F953C8A4091261E8" xlink:to="loc_us-gaap_PlanNameDomain_01E69B1D5D3D359E0DD7C8A409151E38" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_TwoThousandFifteenStockOptionsPlanMember" xlink:label="loc_exls_TwoThousandFifteenStockOptionsPlanMember_5BC3FAA88F7CF8F44F7FC89C05DFE134" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_01E69B1D5D3D359E0DD7C8A409151E38" xlink:to="loc_exls_TwoThousandFifteenStockOptionsPlanMember_5BC3FAA88F7CF8F44F7FC89C05DFE134" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_FB167A6EF73F574605EEC8A26A392497" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_C9D40D6EB652B3ACEF71C89C05DF76A4" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_FB167A6EF73F574605EEC8A26A392497" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FCA68F7AE36E481423E7C8A26A39FB55_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_FB167A6EF73F574605EEC8A26A392497" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FCA68F7AE36E481423E7C8A26A39FB55_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_FCA68F7AE36E481423E7C8A26A39FB55" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_FB167A6EF73F574605EEC8A26A392497" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_FCA68F7AE36E481423E7C8A26A39FB55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_04E4C15B0BF5AB34A3CDC8A29C1D2FDB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_FCA68F7AE36E481423E7C8A26A39FB55" xlink:to="loc_us-gaap_SubsequentEventMember_04E4C15B0BF5AB34A3CDC8A29C1D2FDB" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAvailableForGrant" xlink:label="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAvailableForGrant_A03F1B58ED7A63938A79C89C05DFB0E6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardIncreaseInNumberOfSharesAvailableForGrant_A03F1B58ED7A63938A79C89C05DFB0E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_BA8DFFA64C255B55B1EDC89C05DF2268" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_BA8DFFA64C255B55B1EDC89C05DF2268" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5EBEC38B042FF8CCCC78C8A30A4C0072" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5EBEC38B042FF8CCCC78C8A30A4C0072" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_DF03C61A357256F33094C89C05DFE7B7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_DF03C61A357256F33094C89C05DFE7B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_49F57ABE6A97E28A0EDAC89C05DFC2CE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_FF4B3C303CBB79C9E773C89C05DF44B7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_49F57ABE6A97E28A0EDAC89C05DFC2CE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationCompanysStockOptionsOutstandingAndStockOptionsVestedAndExercisableDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_6F45B5C328CC8B2CA43782A9CFCD466B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_6F45B5C328CC8B2CA43782A9CFCD466B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_CFFC0C05F8C4938DAD3782A9CFCD2A2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_6F45B5C328CC8B2CA43782A9CFCD466B" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_CFFC0C05F8C4938DAD3782A9CFCD2A2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_CFFC0C05F8C4938DAD3782A9CFCD2A2A" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_CFFC0C05F8C4938DAD3782A9CFCD2A2A" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RangeOneMember" xlink:label="loc_exls_RangeOneMember_C5FE53294E70A3F6233482A9CFCD43FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA" xlink:to="loc_exls_RangeOneMember_C5FE53294E70A3F6233482A9CFCD43FD" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RangeTwoMember" xlink:label="loc_exls_RangeTwoMember_5B2C22C08EE2BAD9B40082A9CFCD6072" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA" xlink:to="loc_exls_RangeTwoMember_5B2C22C08EE2BAD9B40082A9CFCD6072" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RangeThreeMember" xlink:label="loc_exls_RangeThreeMember_179F3D4962E7B651B49D82A9CFCD2DF5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_731923016C0292800FB682A9CFCD05AA" xlink:to="loc_exls_RangeThreeMember_179F3D4962E7B651B49D82A9CFCD2DF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_A8DB64E4026B44B2750A82A9CFCDE7F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_A8DB64E4026B44B2750A82A9CFCDE7F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ECF513F277F6720408A882A9CFCD87B1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_ECF513F277F6720408A882A9CFCD87B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_CBD63D95B33612D7A47682A9CFCD75BA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_CBD63D95B33612D7A47682A9CFCD75BA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_D66DB23507783318DA6682A9CFCD970B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_5FFA72B1DED6B83CC3C182A9CFCD4312" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_D66DB23507783318DA6682A9CFCD970B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationCostsRelatedToCompanysStockBasedCompensationPlanDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_378D7583DE1C948EF0592A94D500ECB6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_EACCAABB14CB43853EC62A94D5004359" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_378D7583DE1C948EF0592A94D500ECB6" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_EACCAABB14CB43853EC62A94D5004359" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_940FE2641E76420D65AD2A94D5009C90" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_EACCAABB14CB43853EC62A94D5004359" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_940FE2641E76420D65AD2A94D5009C90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_940FE2641E76420D65AD2A94D5009C90" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_940FE2641E76420D65AD2A94D5009C90" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_BF719D288C80397A2E632A94D5009A9F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F" xlink:to="loc_us-gaap_CostOfSalesMember_BF719D288C80397A2E632A94D5009A9F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_1884D7CDA2B306D656E82A94D5007501" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_1884D7CDA2B306D656E82A94D5007501" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_5E2BBBEE5939C5C272CE2A94D5006757" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_B24AC6BB7F7DA4B4259C2A94D500852F" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_5E2BBBEE5939C5C272CE2A94D5006757" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_12F41D615A388B00C2D32A94D50072BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_378D7583DE1C948EF0592A94D500ECB6" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_12F41D615A388B00C2D32A94D50072BE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationPerformanceBasedStockAwardsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_2D44A131B834653D5E20AF2F20D566CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:to="loc_us-gaap_AwardTypeAxis_2D44A131B834653D5E20AF2F20D566CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_2D44A131B834653D5E20AF2F20D566CC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_2D44A131B834653D5E20AF2F20D566CC" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RevenueBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_A257E4A41F849AB9ED94AF2F20D5D2DA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8" xlink:to="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_A257E4A41F849AB9ED94AF2F20D5D2DA" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_14C6697E36FF345662F9AF2F20D553D6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8" xlink:to="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_14C6697E36FF345662F9AF2F20D553D6" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_PerformanceBasedStockAwardsMember" xlink:label="loc_exls_PerformanceBasedStockAwardsMember_B7B5C289F7C64FE48774AF2F20D5DF3D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7B22674D91C9824C8EC4AF2F20D54DA8" xlink:to="loc_exls_PerformanceBasedStockAwardsMember_B7B5C289F7C64FE48774AF2F20D5DF3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_A6FE3FAB2FD3632DFA5DAF2F20D5C3CF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:to="loc_us-gaap_PlanNameAxis_A6FE3FAB2FD3632DFA5DAF2F20D5C3CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_1951FE1DCB41AF2D6BF5AF2F20D57ABB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_A6FE3FAB2FD3632DFA5DAF2F20D5C3CF" xlink:to="loc_us-gaap_PlanNameDomain_1951FE1DCB41AF2D6BF5AF2F20D57ABB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_1951FE1DCB41AF2D6BF5AF2F20D57ABB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_A6FE3FAB2FD3632DFA5DAF2F20D5C3CF" xlink:to="loc_us-gaap_PlanNameDomain_1951FE1DCB41AF2D6BF5AF2F20D57ABB" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember" xlink:label="loc_exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember_6C052AACEE888DFF49AEAF2F20D5727C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_1951FE1DCB41AF2D6BF5AF2F20D57ABB" xlink:to="loc_exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember_6C052AACEE888DFF49AEAF2F20D5727C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_CC277BD1EB9175A34CA2AF2F20D5736E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:to="loc_us-gaap_RangeAxis_CC277BD1EB9175A34CA2AF2F20D5736E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A7FE834BEF7D0515D13DAF2F20D5CAA6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_CC277BD1EB9175A34CA2AF2F20D5736E" xlink:to="loc_us-gaap_RangeMember_A7FE834BEF7D0515D13DAF2F20D5CAA6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_A7FE834BEF7D0515D13DAF2F20D5CAA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_CC277BD1EB9175A34CA2AF2F20D5736E" xlink:to="loc_us-gaap_RangeMember_A7FE834BEF7D0515D13DAF2F20D5CAA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_220AA8735643CEC83FD2AF2F20D64D7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_A7FE834BEF7D0515D13DAF2F20D5CAA6" xlink:to="loc_us-gaap_MaximumMember_220AA8735643CEC83FD2AF2F20D64D7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_68D86DEDEA63E24B49EBAF2F20D66012" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:to="loc_us-gaap_VestingAxis_68D86DEDEA63E24B49EBAF2F20D66012" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_68D86DEDEA63E24B49EBAF2F20D66012" xlink:to="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_68D86DEDEA63E24B49EBAF2F20D66012" xlink:to="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_1107B203876383F268D7AF2F20D6E924" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_1107B203876383F268D7AF2F20D6E924" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_B49B5524206E36B0D241AF2F20D6B0BF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_F5214D29C167EE1302ECAF2F20D60BA7" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_B49B5524206E36B0D241AF2F20D6B0BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_80DA157F0B7A74F2BF10AF2F20D62843" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA43A88388826167D788AF2F20D5F7C8" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_80DA157F0B7A74F2BF10AF2F20D62843" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_86C4E93FC97C527388FEAF2F20D6BCAE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_80DA157F0B7A74F2BF10AF2F20D62843" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_86C4E93FC97C527388FEAF2F20D6BCAE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_86C4E93FC97C527388FEAF2F20D6BCAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_80DA157F0B7A74F2BF10AF2F20D62843" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_86C4E93FC97C527388FEAF2F20D6BCAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_720EE87AFD6F95C1E60CAF2F20D64B6B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_86C4E93FC97C527388FEAF2F20D6BCAE" xlink:to="loc_us-gaap_SubsequentEventMember_720EE87AFD6F95C1E60CAF2F20D64B6B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested" xlink:label="loc_exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested_0FBD1635626712B9F367AF2F20D6F1FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested_0FBD1635626712B9F367AF2F20D6F1FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A8F73A13AA8C4EF42A91AF2F20D6C947" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_A8F73A13AA8C4EF42A91AF2F20D6C947" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_B39F1159F85879AEDCADAF2F20D698F6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_B39F1159F85879AEDCADAF2F20D698F6" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned" xlink:label="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned_F981603EDAFF14583FFDAF2F20D66143" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned_F981603EDAFF14583FFDAF2F20D66143" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_2573BB35C7FF7DAB7E6CAF2F20D6A5F3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_2573BB35C7FF7DAB7E6CAF2F20D6A5F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_EF8104C1B3A31AD0B8EEAF2F20D6E0F4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_EF8104C1B3A31AD0B8EEAF2F20D6E0F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9E3ADF5C7CEB39088BFAAF2F20D6DE86" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0FF7D80D8FCE2A8CA05EAF2F20D62943" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9E3ADF5C7CEB39088BFAAF2F20D6DE86" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationPerformanceRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_DB8C19950ABB89A228377BCB7652FBB2" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9136585F71B88F0009707BCB765159A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_DB8C19950ABB89A228377BCB7652FBB2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9136585F71B88F0009707BCB765159A0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_05C1320E6F9F059BA5B57BCB765230DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9136585F71B88F0009707BCB765159A0" xlink:to="loc_us-gaap_AwardTypeAxis_05C1320E6F9F059BA5B57BCB765230DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_05C1320E6F9F059BA5B57BCB765230DF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_05C1320E6F9F059BA5B57BCB765230DF" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RevenueBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_5C38C178C493520F469A7BCB76524F51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246" xlink:to="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_5C38C178C493520F469A7BCB76524F51" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_CD5CE744C7AF5D09D8777BCB7652A00A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5221644CDD3E19A05C677BCB76525246" xlink:to="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_CD5CE744C7AF5D09D8777BCB7652A00A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_DB8C19950ABB89A228377BCB7652FBB2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_968F98DC29EEA6373B417BCB7652ABA2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_968F98DC29EEA6373B417BCB7652ABA2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9F0B162C15FAB32580E07BCB7652E33F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9F0B162C15FAB32580E07BCB7652E33F" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonIssuedInPeriod" xlink:label="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonIssuedInPeriod_AFA93AD9661B00257DD07BCB7652D197" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonIssuedInPeriod_AFA93AD9661B00257DD07BCB7652D197" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriod" xlink:label="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriod_001A25693638C3933A077BCB7652F92E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriod_001A25693638C3933A077BCB7652F92E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_12279E0464F321AD39397BCB76520D23" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_12279E0464F321AD39397BCB76520D23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_429583E44F4052754B107BCB7652C3C7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_39E9F0C400797C42244D7BCB7652D8E1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_429583E44F4052754B107BCB7652C3C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_DB8C19950ABB89A228377BCB7652FBB2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_72D6A1BD6DACE0BFFD5C7BCB76527A7B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_72D6A1BD6DACE0BFFD5C7BCB76527A7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_38A33E24CAD8D893FADA7BCB76539760" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_38A33E24CAD8D893FADA7BCB76539760" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriodWeightedAverageIssueDateFairValue" xlink:label="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriodWeightedAverageIssueDateFairValue_227D10FEFD3D81EEB29E7BCB76537AAB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:to="loc_exls_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsIssuedinPeriodWeightedAverageIssueDateFairValue_227D10FEFD3D81EEB29E7BCB76537AAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_E5FD7E6FF258F8E1753B7BCB7653327C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_E5FD7E6FF258F8E1753B7BCB7653327C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_EFF833CA28CEBD7412D67BCB76535FEE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_7437F43B7D3867BDC6367BCB76529B67" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_EFF833CA28CEBD7412D67BCB76535FEE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationRestrictedStockActivityUnderCompanysStockPlansDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_527EB5DDDC68E698333EC715B4117C71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_527EB5DDDC68E698333EC715B4117C71" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_F60F198355C50E10262BC715B4116BB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_527EB5DDDC68E698333EC715B4117C71" xlink:to="loc_us-gaap_AwardTypeAxis_F60F198355C50E10262BC715B4116BB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_F60F198355C50E10262BC715B4116BB3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_F60F198355C50E10262BC715B4116BB3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_14BA95CEC2B739BAF7B7C715B411DCAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881" xlink:to="loc_us-gaap_RestrictedStockMember_14BA95CEC2B739BAF7B7C715B411DCAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_22B35AF7C595E1071B29C715B4118972" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_89E0D6E7E3BFCF8322EFC715B411D881" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_22B35AF7C595E1071B29C715B4118972" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_924FCD1DC8B12712B6EDC715B4119E5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_924FCD1DC8B12712B6EDC715B4119E5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5708FFAD698C625BD49AC715B411D2CA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5708FFAD698C625BD49AC715B411D2CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_A6BD88C326B346EFC8BDC715B4113BE8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_A6BD88C326B346EFC8BDC715B4113BE8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8CC9FD6FF5E4F5EBEBB1C715B411A870" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_8A386DE73458F208D6B7C715B411958E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8CC9FD6FF5E4F5EBEBB1C715B411A870" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_864DFD431C88E4D2CA21C715B4111546" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_864DFD431C88E4D2CA21C715B4111546" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_53885911F2460297D812C715B411F000" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_53885911F2460297D812C715B411F000" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_7C6FDDB0A80E027073A3C715B4114FA3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_7C6FDDB0A80E027073A3C715B4114FA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_454871524274CA795996C715B411689C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_622DD9282BF4748E59A9C715B411A517" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_454871524274CA795996C715B411689C" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RestrictedStockUnitsVestedForWhichUnderlyingCommonStockToBeIssued" xlink:label="loc_exls_RestrictedStockUnitsVestedForWhichUnderlyingCommonStockToBeIssued_893881440E11D38ED030C715B4116458" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:to="loc_exls_RestrictedStockUnitsVestedForWhichUnderlyingCommonStockToBeIssued_893881440E11D38ED030C715B4116458" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_29C54D8FD3BCB8F97537C715B41162A8" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F95D3F680D412E5E45E8C715B4113BAB" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_29C54D8FD3BCB8F97537C715B41162A8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationRestrictedStockAndRsuAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CCC823902454342D11B4C89C05C86856" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CCC823902454342D11B4C89C05C86856" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_B8825A30152750E3F615C89C05C8F7B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CCC823902454342D11B4C89C05C86856" xlink:to="loc_us-gaap_AwardTypeAxis_B8825A30152750E3F615C89C05C8F7B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_B8825A30152750E3F615C89C05C8F7B6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_B8825A30152750E3F615C89C05C8F7B6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RestrictedStockandRestrictedStockUnitsMember" xlink:label="loc_exls_RestrictedStockandRestrictedStockUnitsMember_2863865AE604411DBB18C89C05C87A9D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6" xlink:to="loc_exls_RestrictedStockandRestrictedStockUnitsMember_2863865AE604411DBB18C89C05C87A9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_D2C592AA03FD9E716C1EC89C05C9BE63" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_34A61BC537944E64DFB8C89C05C8B7F6" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_D2C592AA03FD9E716C1EC89C05C9BE63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_D96460A27C64A009C849C89C05C95DD8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CCC823902454342D11B4C89C05C86856" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_D96460A27C64A009C849C89C05C95DD8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CC66CA078F28C633A6AFC89C05C96DB3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_D96460A27C64A009C849C89C05C95DD8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CC66CA078F28C633A6AFC89C05C96DB3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_CC66CA078F28C633A6AFC89C05C96DB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_D96460A27C64A009C849C89C05C95DD8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_CC66CA078F28C633A6AFC89C05C96DB3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_6F1A29D49E9BDEA73D14C89C05C94EE6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_CC66CA078F28C633A6AFC89C05C96DB3" xlink:to="loc_us-gaap_SubsequentEventMember_6F1A29D49E9BDEA73D14C89C05C94EE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_70D4B49923A05D30E6B1C89C05C971EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_70D4B49923A05D30E6B1C89C05C971EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_06636B2D78A16C5D213DC89C05C9C78B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_06636B2D78A16C5D213DC89C05C9C78B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_52EC562150B53512CDAEC89C05C973EB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_52EC562150B53512CDAEC89C05C973EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_7924F56D393837EEDA1EC89C05C902F0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3FD867559DF8EC8A2D6DC89C05C972F8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_7924F56D393837EEDA1EC89C05C902F0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationShareBasedCompensationSummaryOfWeightedAverageValuationAssumptionsForMarketConditionPerformanceRestrictedStockUnitsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D6AA3DFD3D40C03B320F2467F05FB1D5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D6AA3DFD3D40C03B320F2467F05FB1D5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_D89049F8D75C4EF913CF2467F05F3284" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D6AA3DFD3D40C03B320F2467F05FB1D5" xlink:to="loc_us-gaap_AwardTypeAxis_D89049F8D75C4EF913CF2467F05F3284" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FA5DB20233BBFD9B9F3E2467F05FBC53_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_D89049F8D75C4EF913CF2467F05F3284" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FA5DB20233BBFD9B9F3E2467F05FBC53_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FA5DB20233BBFD9B9F3E2467F05FBC53" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_D89049F8D75C4EF913CF2467F05F3284" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FA5DB20233BBFD9B9F3E2467F05FBC53" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_C02328EDE3EA4A88F6C22467F05FBB9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_FA5DB20233BBFD9B9F3E2467F05FBC53" xlink:to="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_C02328EDE3EA4A88F6C22467F05FBB9E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1EAA8BEF263AB9BB62A42467F05FEB32" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1EAA8BEF263AB9BB62A42467F05FEB32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_FC7E1EAD3CEF3BDBFD052467F05F2565" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_FC7E1EAD3CEF3BDBFD052467F05F2565" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_03DB78C6D2786AC07DA02467F05FD891" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_03DB78C6D2786AC07DA02467F05FD891" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BCD37099A1098C244E8F2467F060B8BB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A7E0A1798AC5C8BEF1492467F05F0386" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BCD37099A1098C244E8F2467F060B8BB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationStockBasedCompensationStockOptionActivityDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_746A3AE9137EF17F897C2467F09DE66D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_746A3AE9137EF17F897C2467F09DE66D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_03F645FFC0F918163DAE2467F09DACED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_746A3AE9137EF17F897C2467F09DE66D" xlink:to="loc_us-gaap_AwardTypeAxis_03F645FFC0F918163DAE2467F09DACED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_95504D41D44F23B1445F2467F09D56A7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_03F645FFC0F918163DAE2467F09DACED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_95504D41D44F23B1445F2467F09D56A7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_95504D41D44F23B1445F2467F09D56A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_03F645FFC0F918163DAE2467F09DACED" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_95504D41D44F23B1445F2467F09D56A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_CEC4D5D88D7A23E6619E2467F09D2FAB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_95504D41D44F23B1445F2467F09D56A7" xlink:to="loc_us-gaap_EmployeeStockOptionMember_CEC4D5D88D7A23E6619E2467F09D2FAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_E57BE304850608A73B5F2467F09D61C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_E57BE304850608A73B5F2467F09D61C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_F8BE548B1622EF4E2AD82467F09D4A22" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_F8BE548B1622EF4E2AD82467F09D4A22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_03C16FFB988283799F8A2467F09D5647" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_03C16FFB988283799F8A2467F09D5647" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_4CD9FBF5C3F26711CE732467F09D2061" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_4CD9FBF5C3F26711CE732467F09D2061" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_8442060F385F6C8F936D2467F09D4D48" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_C503CBDD5BFFEBBDF80B2467F09DA243" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_8442060F385F6C8F936D2467F09D4D48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_489BF3640F918A87C9422467F09D2624" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_489BF3640F918A87C9422467F09D2624" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_18BF592BAAE8E2D5D56F2467F09DD8D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_18BF592BAAE8E2D5D56F2467F09DD8D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_E588AD6983EB963001F22467F09D7131" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_E588AD6983EB963001F22467F09D7131" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_028F84656C45DF1F4E382467F09DD1E5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_028F84656C45DF1F4E382467F09DD1E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_943F79FF03CDAD0049332467F09E981C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_8089CAA7C92E1B9DE5E02467F09D0003" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_943F79FF03CDAD0049332467F09E981C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_B4FBEC52A8CC36384D9E24E1438DE90D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_B4FBEC52A8CC36384D9E24E1438DE90D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_76714786E0070E677E9D2467F09E1B9B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_76714786E0070E677E9D2467F09E1B9B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_1DE5BD7D074DAD94DA172467F09E5E7A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_1DE5BD7D074DAD94DA172467F09E5E7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_B4AEA5679B46B1132F872467F09E41A3" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_7A262A5FBE0537EEB9662467F09D25E8" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1_B4AEA5679B46B1132F872467F09E41A3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationStockOptionsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_874DD527EC49DD81073B2467F07DBACA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_874DD527EC49DD81073B2467F07DBACA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_CD5FAD747CE042C617B02467F07DBC19" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_874DD527EC49DD81073B2467F07DBACA" xlink:to="loc_us-gaap_AwardTypeAxis_CD5FAD747CE042C617B02467F07DBC19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B0EB9C64D4E6606E201F2467F07DE182_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_CD5FAD747CE042C617B02467F07DBC19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B0EB9C64D4E6606E201F2467F07DE182_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B0EB9C64D4E6606E201F2467F07DE182" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_CD5FAD747CE042C617B02467F07DBC19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B0EB9C64D4E6606E201F2467F07DE182" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_E9E9DF3DD8A29214E92A2467F07DEBDF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_B0EB9C64D4E6606E201F2467F07DE182" xlink:to="loc_us-gaap_EmployeeStockOptionMember_E9E9DF3DD8A29214E92A2467F07DEBDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_462D7E19A5159A9B1F892467F07E633A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_462D7E19A5159A9B1F892467F07E633A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_0C5084CF4D7A2CADAAE72467F07EA909" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_0C5084CF4D7A2CADAAE72467F07EA909" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_CB774F1B1ED7FABFA6E12467F07ECB25" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_CB774F1B1ED7FABFA6E12467F07ECB25" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_833E1A250F7C6C95D0812467F07E7C29" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A9D85F580EF17E246EB62467F07D2D55" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_833E1A250F7C6C95D0812467F07E7C29" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/StockBasedCompensationTables" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9629391AED2FC48A71BD2467F0C890BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9629391AED2FC48A71BD2467F0C890BE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_5F3AFEEA8A30ED034A952467F0C86C13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_9629391AED2FC48A71BD2467F0C890BE" xlink:to="loc_us-gaap_AwardTypeAxis_5F3AFEEA8A30ED034A952467F0C86C13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5F3AFEEA8A30ED034A952467F0C86C13" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5F3AFEEA8A30ED034A952467F0C86C13" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RestrictedStockandRestrictedStockUnitsMember" xlink:label="loc_exls_RestrictedStockandRestrictedStockUnitsMember_C34B5A1718BC84DA4CEA24EE2003EB4B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2" xlink:to="loc_exls_RestrictedStockandRestrictedStockUnitsMember_C34B5A1718BC84DA4CEA24EE2003EB4B" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_PerformanceBasedStockAwardsMember" xlink:label="loc_exls_PerformanceBasedStockAwardsMember_1E0DC63857F76BD794B52467F0C8AE48" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_AF8358F55E789FC805832467F0C8DFE2" xlink:to="loc_exls_PerformanceBasedStockAwardsMember_1E0DC63857F76BD794B52467F0C8AE48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_DEEA86D2014B494E41802467F0C9C0FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_DEEA86D2014B494E41802467F0C9C0FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_AFF28B1AC115BCE7CC862467F0C9EBCE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_AFF28B1AC115BCE7CC862467F0C9EBCE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_67DC3FD57351218E750F2467F0C9A56F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock_67DC3FD57351218E750F2467F0C9A56F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock" xlink:label="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_93F87C18BFE6EA80EBA72467F0C98733" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock_93F87C18BFE6EA80EBA72467F0C98733" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ScheduleofShareBasedStockUnitsValuationAssumptionsTableTextBlock" xlink:label="loc_exls_ScheduleofShareBasedStockUnitsValuationAssumptionsTableTextBlock_DD195D031640409FA6EC2467F0C9A260" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9DFCF1135657CCBF91E72467F0C8CC99" xlink:to="loc_exls_ScheduleofShareBasedStockUnitsValuationAssumptionsTableTextBlock_DD195D031640409FA6EC2467F0C9A260" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesAccountsReceivableAdditionalInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesShareBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_5A6BECE80706304B76DBAF2F24391586" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:to="loc_us-gaap_PlanNameAxis_5A6BECE80706304B76DBAF2F24391586" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_FB47FC415B0A52E6C685AF2F243A70B3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_5A6BECE80706304B76DBAF2F24391586" xlink:to="loc_us-gaap_PlanNameDomain_FB47FC415B0A52E6C685AF2F243A70B3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_FB47FC415B0A52E6C685AF2F243A70B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_5A6BECE80706304B76DBAF2F24391586" xlink:to="loc_us-gaap_PlanNameDomain_FB47FC415B0A52E6C685AF2F243A70B3" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember" xlink:label="loc_exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember_276193619BE77EF5F009AF2F243A49CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_FB47FC415B0A52E6C685AF2F243A70B3" xlink:to="loc_exls_AmendmentAndRestatementOfThe2006OmnibusAwardPlan2015PlanMember_276193619BE77EF5F009AF2F243A49CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_E9A12046267E95A2B1E8AF2F243AC2B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:to="loc_us-gaap_AwardTypeAxis_E9A12046267E95A2B1E8AF2F243AC2B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_E9A12046267E95A2B1E8AF2F243AC2B3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_E9A12046267E95A2B1E8AF2F243AC2B3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_RevenueBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_697A083F993C38E6FAADAF2F243AB49D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA" xlink:to="loc_exls_RevenueBasedPerformanceRestrictedStockUnitsMember_697A083F993C38E6FAADAF2F243AB49D" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember" xlink:label="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_B29FEDF786A6CE6CE170AF2F243A227C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_38A21B67AF6D8BDA1C43AF2F243A5EEA" xlink:to="loc_exls_MarketConditionBasedPerformanceRestrictedStockUnitsMember_B29FEDF786A6CE6CE170AF2F243A227C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_5A81C83EC39ABC68015EAF2F243AACBD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:to="loc_us-gaap_RangeAxis_5A81C83EC39ABC68015EAF2F243AACBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_97DBC4D21CD8AE694CB2AF2F243A0038_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_5A81C83EC39ABC68015EAF2F243AACBD" xlink:to="loc_us-gaap_RangeMember_97DBC4D21CD8AE694CB2AF2F243A0038_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_97DBC4D21CD8AE694CB2AF2F243A0038" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_5A81C83EC39ABC68015EAF2F243AACBD" xlink:to="loc_us-gaap_RangeMember_97DBC4D21CD8AE694CB2AF2F243A0038" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_27AAE2C9AC8DEB24C307AF2F243A09D6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_97DBC4D21CD8AE694CB2AF2F243A0038" xlink:to="loc_us-gaap_MaximumMember_27AAE2C9AC8DEB24C307AF2F243A09D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_C5F2D6B806AFEF9B4997AF2F243A2A8A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_C5F2D6B806AFEF9B4997AF2F243A2A8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_C5F2D6B806AFEF9B4997AF2F243A2A8A" xlink:to="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_C5F2D6B806AFEF9B4997AF2F243A2A8A" xlink:to="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_FD366F22BF5E02776878AF2F243A4540" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_FD366F22BF5E02776878AF2F243A4540" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_A1C6C59F6692C5D56D55AF2F243A3681" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_CE4BE41A5B98683F0BE1AF2F243AEA97" xlink:to="loc_us-gaap_RetainedEarningsMember_A1C6C59F6692C5D56D55AF2F243A3681" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_30EFEE8E46DBA13D3CC6AF2F243AE5E4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_D5874224A8EC8AD2F398AF2F2439C5F0" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_30EFEE8E46DBA13D3CC6AF2F243AE5E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_004B6A6068742435BEEDAF2F243A5F12_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_30EFEE8E46DBA13D3CC6AF2F243AE5E4" xlink:to="loc_us-gaap_TypeOfAdoptionMember_004B6A6068742435BEEDAF2F243A5F12_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_004B6A6068742435BEEDAF2F243A5F12" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_30EFEE8E46DBA13D3CC6AF2F243AE5E4" xlink:to="loc_us-gaap_TypeOfAdoptionMember_004B6A6068742435BEEDAF2F243A5F12" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_AccountingStandardsUpdate201609Member" xlink:label="loc_exls_AccountingStandardsUpdate201609Member_A794EEFEA24D65CE1AF7AF2F243A68E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_004B6A6068742435BEEDAF2F243A5F12" xlink:to="loc_exls_AccountingStandardsUpdate201609Member_A794EEFEA24D65CE1AF7AF2F243A68E0" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested" xlink:label="loc_exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested_4712745D023A448038BAAF2F243A6D09" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_exls_PercentageOfPerformanceCriteriaAchievedAndSharesVested_4712745D023A448038BAAF2F243A6D09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5EDF954EEA32CD08D6E7AF2F243B41D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5EDF954EEA32CD08D6E7AF2F243B41D3" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned" xlink:label="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned_1CAFEE4242B4F223BAB4AF2F243B43EA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_exls_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetSharesEarned_1CAFEE4242B4F223BAB4AF2F243B43EA" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount" xlink:label="loc_exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount_196829EBA8ACA8AE0C83AF2F243BB310" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_exls_EffectiveIncomeTaxRateReconciliationSharebasedCompensationExcessTaxBenefitAmount_196829EBA8ACA8AE0C83AF2F243BB310" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption" xlink:label="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_28362FFCDED523C2401FAF2F243B966E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption_28362FFCDED523C2401FAF2F243B966E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_60CF8BFFF70444DCC19EAF2F243BD362" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_803436513C5AFE7B2D90AF2F243A1605" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_60CF8BFFF70444DCC19EAF2F243BD362" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfLivedIntangibleAssetsAmortizedOverTheirEstimatedUsefulLivesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_7FF01EA303BE3EA4F455521D4DC844C3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_BE89512DEE72ECA89599521D4DC6E125" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_7FF01EA303BE3EA4F455521D4DC844C3" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_BE89512DEE72ECA89599521D4DC6E125" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D4B8AFE2751A79AAD554521D4DC77F7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_BE89512DEE72ECA89599521D4DC6E125" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D4B8AFE2751A79AAD554521D4DC77F7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D4B8AFE2751A79AAD554521D4DC77F7F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_D4B8AFE2751A79AAD554521D4DC77F7F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_12DA74FF13063B9422CE521D4DC758B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:to="loc_us-gaap_CustomerRelationshipsMember_12DA74FF13063B9422CE521D4DC758B3" xlink:type="arc" />
    <link:loc xlink:href="exls-20171231.xsd#exls_LeaseholdBenefitsMember" xlink:label="loc_exls_LeaseholdBenefitsMember_D193327238A87995C330521D4DC70156" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:to="loc_exls_LeaseholdBenefitsMember_D193327238A87995C330521D4DC70156" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_64733212A235D7949976521D4DC75D03" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_64733212A235D7949976521D4DC75D03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_2B60031791B56FF2A26D521D4DC777BC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_2B60031791B56FF2A26D521D4DC777BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_F52BC91D093741104D23521D4DC7DB23" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7A2CBA4FA52422A5DC49521D4DC71D62" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_F52BC91D093741104D23521D4DC7DB23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_C0DA90FA1E83C2A38CD8521D4DC8D30A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_BE89512DEE72ECA89599521D4DC6E125" xlink:to="loc_us-gaap_RangeAxis_C0DA90FA1E83C2A38CD8521D4DC8D30A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_C0DA90FA1E83C2A38CD8521D4DC8D30A" xlink:to="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_C0DA90FA1E83C2A38CD8521D4DC8D30A" xlink:to="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_B531860ABECC36D1967B521D4DC8855F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC" xlink:to="loc_us-gaap_MinimumMember_B531860ABECC36D1967B521D4DC8855F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_21EC487C95FF0B12B44F521D4DC825AF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_BB27DA49BEA4C738A6DB521D4DC8F5FC" xlink:to="loc_us-gaap_MaximumMember_21EC487C95FF0B12B44F521D4DC825AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_8D5406DFA521C7FC3ADD521D4DC88F94" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_7FF01EA303BE3EA4F455521D4DC844C3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_8D5406DFA521C7FC3ADD521D4DC88F94" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfRevenuesAndReimbursementsAdditionalInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesSummaryOfSignificantAccountingPoliciesScheduleOfPropertyAndEquipmentEstimatedUsefulLivesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_90DF927187E3A71F3C981EEEC2972208" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_02475CE49844740FC1391EEEC295DF48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_90DF927187E3A71F3C981EEEC2972208" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_02475CE49844740FC1391EEEC295DF48" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_3F06473A381D09B306BD1EEEC2977F75" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_02475CE49844740FC1391EEEC295DF48" xlink:to="loc_us-gaap_RangeAxis_3F06473A381D09B306BD1EEEC2977F75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_3F06473A381D09B306BD1EEEC2977F75" xlink:to="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_3F06473A381D09B306BD1EEEC2977F75" xlink:to="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_A7B157BE16F0A2383E6D1EF325FEE85E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A" xlink:to="loc_us-gaap_MinimumMember_A7B157BE16F0A2383E6D1EF325FEE85E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_D692CE9E2ADA2954B2BF1EF3298B10E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_C8C5E017C6EAE7EF4FBB1EEEC297456A" xlink:to="loc_us-gaap_MaximumMember_D692CE9E2ADA2954B2BF1EF3298B10E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DC1F2048F50741DA345B1EEEC2966D38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_02475CE49844740FC1391EEEC295DF48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DC1F2048F50741DA345B1EEEC2966D38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DC1F2048F50741DA345B1EEEC2966D38" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_DC1F2048F50741DA345B1EEEC2966D38" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_TechnologyEquipmentMember" xlink:label="loc_us-gaap_TechnologyEquipmentMember_BCF9D0B87DC9ADA514C81EF324F04E62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_TechnologyEquipmentMember_BCF9D0B87DC9ADA514C81EF324F04E62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_43AB734BA573D98A24F41EF32B857794" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_43AB734BA573D98A24F41EF32B857794" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_LeaseholdImprovementsMember" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_942B876D67CE9081038E1EF331193A59" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_942B876D67CE9081038E1EF331193A59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_3FA4C0A4B7DCF99ACC5B1EF33713C70F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_3FA4C0A4B7DCF99ACC5B1EF33713C70F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_2FDA1F915A8A6CD6428D1EF33BF7C054" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_VehiclesMember_2FDA1F915A8A6CD6428D1EF33BF7C054" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_BuildingMember" xlink:label="loc_us-gaap_BuildingMember_7D661FDDCF7B9F1F3D591EF9D36718EB" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5C785BDED380751ECC8A1EEEC2963E86" xlink:to="loc_us-gaap_BuildingMember_7D661FDDCF7B9F1F3D591EF9D36718EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_F0094D3E5B272129357B1EF322FE2E38" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_90DF927187E3A71F3C981EEEC2972208" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_F0094D3E5B272129357B1EF322FE2E38" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.exlservice.com/role/SummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
</link:linkbase>
