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  <xs:element id="iff_DerivativeNotionalAmountNet" abstract="false" name="DerivativeNotionalAmountNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_ForeignCurrencyContractMember" abstract="true" name="ForeignCurrencyContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_AccumulatedGainLossNetCashFlowHedgeAndInvestmentHedgeParentMember" abstract="true" name="AccumulatedGainLossNetCashFlowHedgeAndInvestmentHedgeParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_AccumulatedOtherComprehensiveIncomeLossRollForward" abstract="true" name="AccumulatedOtherComprehensiveIncomeLossRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iff_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIDueToBusinessDivestitures" abstract="false" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIDueToBusinessDivestitures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_ScheduleOfReclassificationOfAccumulatedOtherComprehensiveIncomeLossTable" abstract="true" name="ScheduleOfReclassificationOfAccumulatedOtherComprehensiveIncomeLossTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="iff_ScheduleOfReclassificationOfAccumulatedOtherComprehensiveIncomeLossLineItems" abstract="true" name="ScheduleOfReclassificationOfAccumulatedOtherComprehensiveIncomeLossLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iff_CommitmentsAndContingenciesTable" abstract="true" name="CommitmentsAndContingenciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="iff_PledgedAssetsMember" abstract="true" name="PledgedAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_BankGuaranteesCommercialGuaranteesStandbyLettersOfCreditAndSuretyBondsMember" abstract="true" name="BankGuaranteesCommercialGuaranteesStandbyLettersOfCreditAndSuretyBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_SolaeLLCMemphisMember" abstract="true" name="SolaeLLCMemphisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_WastewaterDisposalMember" abstract="true" name="WastewaterDisposalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_FrutaromLitigationMember" abstract="true" name="FrutaromLitigationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_PutativeClassActionMember" abstract="true" name="PutativeClassActionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_AntitrustClassActionMember" abstract="true" name="AntitrustClassActionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_IEEPATariffRefundMember" abstract="true" name="IEEPATariffRefundMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_CommitmentsAndContingenciesLineItems" abstract="true" name="CommitmentsAndContingenciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="iff_BankGuaranteesCommercialGuaranteesStandbyLettersOfCreditAndSuretyBondsFacilityAmounts" abstract="false" name="BankGuaranteesCommercialGuaranteesStandbyLettersOfCreditAndSuretyBondsFacilityAmounts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_BankGuaranteesStandbyLettersOfCreditAndCommercialGuaranteesAmountOutstanding" abstract="false" name="BankGuaranteesStandbyLettersOfCreditAndCommercialGuaranteesAmountOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_AmountOfPledgedAssetsPrincipallyPropertyPlantAndEquipmentToCoverIncomeTaxAndIndirectTaxAssessments" abstract="false" name="AmountOfPledgedAssetsPrincipallyPropertyPlantAndEquipmentToCoverIncomeTaxAndIndirectTaxAssessments" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_BankGuaranteesAndPledgedAssetsToPursueDefensesRelatedToOtherContingencies" abstract="false" name="BankGuaranteesAndPledgedAssetsToPursueDefensesRelatedToOtherContingencies" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="iff_RevisionOfPriorPeriodRevisedAmountMember" abstract="true" name="RevisionOfPriorPeriodRevisedAmountMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_BotanicalExtractsVitaminsMineralsAndFoodEnhancementProductsPortfolioMember" abstract="true" name="BotanicalExtractsVitaminsMineralsAndFoodEnhancementProductsPortfolioMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_A2025ShareRepurchaseProgramMember" abstract="true" name="A2025ShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_AcceleratedShareRepurchaseProgramMember" abstract="true" name="AcceleratedShareRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="iff_ShareRepurchaseProgramExpectedCompletionIn2027Member" abstract="true" name="ShareRepurchaseProgramExpectedCompletionIn2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
