<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c1ff6-d4e1-7de1-b1f5-027f91df6c7d,g:1a3fa854-ad24-4ff5-b142-0192914aadee-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:apd="http://www.airproducts.com/20260331" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.airproducts.com/20260331">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="apd-20260331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="apd-20260331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="apd-20260331_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="apd-20260331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.airproducts.com/role/Cover">
        <link:definition>0000001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedIncomeStatementsUnaudited" roleURI="http://www.airproducts.com/role/ConsolidatedIncomeStatementsUnaudited">
        <link:definition>9952151 - Statement - Consolidated Income Statements (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedComprehensiveIncomeStatementsUnaudited" roleURI="http://www.airproducts.com/role/ConsolidatedComprehensiveIncomeStatementsUnaudited">
        <link:definition>9952152 - Statement - Consolidated Comprehensive Income Statements (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedComprehensiveIncomeStatementsUnauditedParenthetical" roleURI="http://www.airproducts.com/role/ConsolidatedComprehensiveIncomeStatementsUnauditedParenthetical">
        <link:definition>9952153 - Statement - Consolidated Comprehensive Income Statements (Unaudited) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsUnaudited" roleURI="http://www.airproducts.com/role/ConsolidatedBalanceSheetsUnaudited">
        <link:definition>9952154 - Statement - Consolidated Balance Sheets (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsUnauditedParenthetical" roleURI="http://www.airproducts.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical">
        <link:definition>9952155 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlowsUnaudited" roleURI="http://www.airproducts.com/role/ConsolidatedStatementsofCashFlowsUnaudited">
        <link:definition>9952156 - Statement - Consolidated Statements of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofEquityUnaudited" roleURI="http://www.airproducts.com/role/ConsolidatedStatementsofEquityUnaudited">
        <link:definition>9952157 - Statement - Consolidated Statements of Equity (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofEquityUnauditedParenthetical" roleURI="http://www.airproducts.com/role/ConsolidatedStatementsofEquityUnauditedParenthetical">
        <link:definition>9952158 - Statement - Consolidated Statements of Equity (Unaudited) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandMajorAccountingPolicies" roleURI="http://www.airproducts.com/role/BasisofPresentationandMajorAccountingPolicies">
        <link:definition>9952159 - Disclosure - Basis of Presentation and Major Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingGuidance" roleURI="http://www.airproducts.com/role/NewAccountingGuidance">
        <link:definition>9952160 - Disclosure - New Accounting Guidance</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntities" roleURI="http://www.airproducts.com/role/VariableInterestEntities">
        <link:definition>9952161 - Disclosure - Variable Interest Entities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessandAssetActions" roleURI="http://www.airproducts.com/role/BusinessandAssetActions">
        <link:definition>9952162 - Disclosure - Business and Asset Actions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognition" roleURI="http://www.airproducts.com/role/RevenueRecognition">
        <link:definition>9952163 - Disclosure - Revenue Recognition</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventories" roleURI="http://www.airproducts.com/role/Inventories">
        <link:definition>9952164 - Disclosure - Inventories</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Goodwill" roleURI="http://www.airproducts.com/role/Goodwill">
        <link:definition>9952165 - Disclosure - Goodwill</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstruments" roleURI="http://www.airproducts.com/role/FinancialInstruments">
        <link:definition>9952166 - Disclosure - Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.airproducts.com/role/FairValueMeasurements">
        <link:definition>9952167 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.airproducts.com/role/Debt">
        <link:definition>9952168 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefits" roleURI="http://www.airproducts.com/role/RetirementBenefits">
        <link:definition>9952169 - Disclosure - Retirement Benefits</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.airproducts.com/role/CommitmentsandContingencies">
        <link:definition>9952170 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensation" roleURI="http://www.airproducts.com/role/ShareBasedCompensation">
        <link:definition>9952171 - Disclosure - Share-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLoss" roleURI="http://www.airproducts.com/role/AccumulatedOtherComprehensiveLoss">
        <link:definition>9952172 - Disclosure - Accumulated Other Comprehensive Loss</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShare" roleURI="http://www.airproducts.com/role/EarningsLossPerShare">
        <link:definition>9952173 - Disclosure - Earnings (Loss) Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.airproducts.com/role/IncomeTaxes">
        <link:definition>9952174 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalInformation" roleURI="http://www.airproducts.com/role/SupplementalInformation">
        <link:definition>9952175 - Disclosure - Supplemental Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentInformation" roleURI="http://www.airproducts.com/role/BusinessSegmentInformation">
        <link:definition>9952176 - Disclosure - Business Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandMajorAccountingPoliciesPolicies" roleURI="http://www.airproducts.com/role/BasisofPresentationandMajorAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Basis of Presentation and Major Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntitiesTables" roleURI="http://www.airproducts.com/role/VariableInterestEntitiesTables">
        <link:definition>9955512 - Disclosure - Variable Interest Entities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessandAssetActionsTables" roleURI="http://www.airproducts.com/role/BusinessandAssetActionsTables">
        <link:definition>9955513 - Disclosure - Business and Asset Actions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognitionTables" roleURI="http://www.airproducts.com/role/RevenueRecognitionTables">
        <link:definition>9955514 - Disclosure - Revenue Recognition (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesTables" roleURI="http://www.airproducts.com/role/InventoriesTables">
        <link:definition>9955515 - Disclosure - Inventories (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillTables" roleURI="http://www.airproducts.com/role/GoodwillTables">
        <link:definition>9955516 - Disclosure - Goodwill (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsTables" roleURI="http://www.airproducts.com/role/FinancialInstrumentsTables">
        <link:definition>9955517 - Disclosure - Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.airproducts.com/role/FairValueMeasurementsTables">
        <link:definition>9955518 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitsTables" roleURI="http://www.airproducts.com/role/RetirementBenefitsTables">
        <link:definition>9955519 - Disclosure - Retirement Benefits (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationTables" roleURI="http://www.airproducts.com/role/ShareBasedCompensationTables">
        <link:definition>9955520 - Disclosure - Share-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossTables" roleURI="http://www.airproducts.com/role/AccumulatedOtherComprehensiveLossTables">
        <link:definition>9955521 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShareTables" roleURI="http://www.airproducts.com/role/EarningsLossPerShareTables">
        <link:definition>9955522 - Disclosure - Earnings (Loss) Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentInformationTables" roleURI="http://www.airproducts.com/role/BusinessSegmentInformationTables">
        <link:definition>9955523 - Disclosure - Business Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntitiesNGHCJointVentureProjectFinancingDetails" roleURI="http://www.airproducts.com/role/VariableInterestEntitiesNGHCJointVentureProjectFinancingDetails">
        <link:definition>9955524 - Disclosure - Variable Interest Entities (NGHC Joint Venture Project Financing) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntitiesNGHCJointVentureByBalanceSheetItemsDetails" roleURI="http://www.airproducts.com/role/VariableInterestEntitiesNGHCJointVentureByBalanceSheetItemsDetails">
        <link:definition>9955525 - Disclosure - Variable Interest Entities (NGHC Joint Venture By Balance Sheet Items) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntitiesJIGPCJointVentureDetails" roleURI="http://www.airproducts.com/role/VariableInterestEntitiesJIGPCJointVentureDetails">
        <link:definition>9955526 - Disclosure - Variable Interest Entities (JIGPC Joint Venture) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="VariableInterestEntitiesWorldEnergyDetails" roleURI="http://www.airproducts.com/role/VariableInterestEntitiesWorldEnergyDetails">
        <link:definition>9955527 - Disclosure - Variable Interest Entities (World Energy) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessandAssetActionsNarrativeDetails" roleURI="http://www.airproducts.com/role/BusinessandAssetActionsNarrativeDetails">
        <link:definition>9955528 - Disclosure - Business and Asset Actions (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessandAssetActionsProjectExitCostsDetails" roleURI="http://www.airproducts.com/role/BusinessandAssetActionsProjectExitCostsDetails">
        <link:definition>9955529 - Disclosure - Business and Asset Actions (Project Exit Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessandAssetActionsGlobalCostReductionPlanDetails" roleURI="http://www.airproducts.com/role/BusinessandAssetActionsGlobalCostReductionPlanDetails">
        <link:definition>9955530 - Disclosure - Business and Asset Actions (Global Cost Reduction Plan) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognitionDisaggregationofRevenueDetails" roleURI="http://www.airproducts.com/role/RevenueRecognitionDisaggregationofRevenueDetails">
        <link:definition>9955531 - Disclosure - Revenue Recognition (Disaggregation of Revenue) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognitionRemainingPerformanceObligationsDetails" roleURI="http://www.airproducts.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails">
        <link:definition>9955532 - Disclosure - Revenue Recognition (Remaining Performance Obligations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognitionRemainingPerformanceObligationsDetails_1" roleURI="http://www.airproducts.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails_1">
        <link:definition>9955532 - Disclosure - Revenue Recognition (Remaining Performance Obligations) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRecognitionContractAssetsandLiabilitiesDetails" roleURI="http://www.airproducts.com/role/RevenueRecognitionContractAssetsandLiabilitiesDetails">
        <link:definition>9955533 - Disclosure - Revenue Recognition (Contract Assets and Liabilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesScheduleofInventoryDetails" roleURI="http://www.airproducts.com/role/InventoriesScheduleofInventoryDetails">
        <link:definition>9955534 - Disclosure - Inventories (Schedule of Inventory) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillScheduleofGoodwillbySegmentDetails" roleURI="http://www.airproducts.com/role/GoodwillScheduleofGoodwillbySegmentDetails">
        <link:definition>9955535 - Disclosure - Goodwill (Schedule of Goodwill by Segment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillScheduleofAccumulatedImpairmentLossesDetails" roleURI="http://www.airproducts.com/role/GoodwillScheduleofAccumulatedImpairmentLossesDetails">
        <link:definition>9955536 - Disclosure - Goodwill (Schedule of Accumulated Impairment Losses) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsNarrativeDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsNarrativeDetails">
        <link:definition>9955537 - Disclosure - Financial Instruments (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsCurrencyPriceRiskManagementInstrumentsDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsCurrencyPriceRiskManagementInstrumentsDetails">
        <link:definition>9955538 - Disclosure - Financial Instruments (Currency Price Risk Management Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsInterestRateManagementContractsandCrossCurrencyInterestRateSwapsDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsInterestRateManagementContractsandCrossCurrencyInterestRateSwapsDetails">
        <link:definition>9955539 - Disclosure - Financial Instruments (Interest Rate Management Contracts and Cross Currency Interest Rate Swaps) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsCarryingAmountandCumulativeHedgingAdjustmentDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsCarryingAmountandCumulativeHedgingAdjustmentDetails">
        <link:definition>9955540 - Disclosure - Financial Instruments (Carrying Amount and Cumulative Hedging Adjustment) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsFairValueandBalanceSheetLocationofDerivativesDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsFairValueandBalanceSheetLocationofDerivativesDetails">
        <link:definition>9955541 - Disclosure - Financial Instruments (Fair Value and Balance Sheet Location of Derivatives) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsGainsandLossesRecognizedInOtherComprehensiveIncomeDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsGainsandLossesRecognizedInOtherComprehensiveIncomeDetails">
        <link:definition>9955542 - Disclosure - Financial Instruments (Gains and Losses Recognized In Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsCashFlowandFairValueHedgesLocationandAmountsRecognizedDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsCashFlowandFairValueHedgesLocationandAmountsRecognizedDetails">
        <link:definition>9955543 - Disclosure - Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FinancialInstrumentsEffectsofDerivativesNotDesignatedasaHedgingInstrumentDetails" roleURI="http://www.airproducts.com/role/FinancialInstrumentsEffectsofDerivativesNotDesignatedasaHedgingInstrumentDetails">
        <link:definition>9955544 - Disclosure - Financial Instruments (Effects of Derivatives Not Designated as a Hedging Instrument) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsScheduleoftheCarryingValuesandFairValuesofFinancialInstrumentsDetails" roleURI="http://www.airproducts.com/role/FairValueMeasurementsScheduleoftheCarryingValuesandFairValuesofFinancialInstrumentsDetails">
        <link:definition>9955545 - Disclosure - Fair Value Measurements (Schedule of the Carrying Values and Fair Values of Financial Instruments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsScheduleofRecurringFairValueMeasurementsDetails" roleURI="http://www.airproducts.com/role/FairValueMeasurementsScheduleofRecurringFairValueMeasurementsDetails">
        <link:definition>9955546 - Disclosure - Fair Value Measurements (Schedule of Recurring Fair Value Measurements) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsScheduleofNonrecurringFairValueMeasurementsDetails" roleURI="http://www.airproducts.com/role/FairValueMeasurementsScheduleofNonrecurringFairValueMeasurementsDetails">
        <link:definition>9955547 - Disclosure - Fair Value Measurements (Schedule of Nonrecurring Fair Value Measurements) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtUSCommittedCreditFacilitiesDetails" roleURI="http://www.airproducts.com/role/DebtUSCommittedCreditFacilitiesDetails">
        <link:definition>9955548 - Disclosure - Debt (U.S. Committed Credit Facilities) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtRepaymentsDetails" roleURI="http://www.airproducts.com/role/DebtRepaymentsDetails">
        <link:definition>9955549 - Disclosure - Debt (Repayments) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitsScheduleofNetPeriodicBenefitCostDetails" roleURI="http://www.airproducts.com/role/RetirementBenefitsScheduleofNetPeriodicBenefitCostDetails">
        <link:definition>9955550 - Disclosure - Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RetirementBenefitsNarrativeDetails" roleURI="http://www.airproducts.com/role/RetirementBenefitsNarrativeDetails">
        <link:definition>9955551 - Disclosure - Retirement Benefits (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesLitigationandEnvironmentalNarrativeDetails" roleURI="http://www.airproducts.com/role/CommitmentsandContingenciesLitigationandEnvironmentalNarrativeDetails">
        <link:definition>9955552 - Disclosure - Commitments and Contingencies (Litigation and Environmental - Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesPacePiedmontandPasadenaNarrativeDetails" roleURI="http://www.airproducts.com/role/CommitmentsandContingenciesPacePiedmontandPasadenaNarrativeDetails">
        <link:definition>9955553 - Disclosure - Commitments and Contingencies (Pace, Piedmont and Pasadena - Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationNarrativeDetails" roleURI="http://www.airproducts.com/role/ShareBasedCompensationNarrativeDetails">
        <link:definition>9955554 - Disclosure - Share-Based Compensation (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationCompensationCostRecognizedinIncomeStatementDetails" roleURI="http://www.airproducts.com/role/ShareBasedCompensationCompensationCostRecognizedinIncomeStatementDetails">
        <link:definition>9955555 - Disclosure - Share-Based Compensation (Compensation Cost Recognized in Income Statement) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ShareBasedCompensationMarketBasedDeferredStockUnitValuationAssumptionsDetails" roleURI="http://www.airproducts.com/role/ShareBasedCompensationMarketBasedDeferredStockUnitValuationAssumptionsDetails">
        <link:definition>9955556 - Disclosure - Share-Based Compensation (Market-Based Deferred Stock Unit Valuation Assumptions) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossRollforwardDetails" roleURI="http://www.airproducts.com/role/AccumulatedOtherComprehensiveLossRollforwardDetails">
        <link:definition>9955557 - Disclosure - Accumulated Other Comprehensive Loss (Rollforward) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossReclassificationDetails" roleURI="http://www.airproducts.com/role/AccumulatedOtherComprehensiveLossReclassificationDetails">
        <link:definition>9955558 - Disclosure - Accumulated Other Comprehensive Loss (Reclassification) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EarningsLossPerShareScheduleofEarningsPerShareDetails" roleURI="http://www.airproducts.com/role/EarningsLossPerShareScheduleofEarningsPerShareDetails">
        <link:definition>9955559 - Disclosure - Earnings (Loss) Per Share (Schedule of Earnings Per Share) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveTaxRateDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesEffectiveTaxRateDetails">
        <link:definition>9955560 - Disclosure - Income Taxes (Effective Tax Rate) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveTaxRateBusinessandAssetActionsDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesEffectiveTaxRateBusinessandAssetActionsDetails">
        <link:definition>9955561 - Disclosure - Income Taxes (Effective Tax Rate-Business and Asset Actions) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveTaxRateTaxReformAdjustmentRelatedtoDeemedForeignDividendsDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesEffectiveTaxRateTaxReformAdjustmentRelatedtoDeemedForeignDividendsDetails">
        <link:definition>9955562 - Disclosure - Income Taxes (Effective Tax Rate-Tax Reform Adjustment Related to Deemed Foreign Dividends) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveTaxRateTaxonRepatriationofForeignEarningsDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesEffectiveTaxRateTaxonRepatriationofForeignEarningsDetails">
        <link:definition>9955563 - Disclosure - Income Taxes (Effective Tax Rate-Tax on Repatriation of Foreign Earnings) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveTaxRateShareholderActivismRelatedCostsDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesEffectiveTaxRateShareholderActivismRelatedCostsDetails">
        <link:definition>9955564 - Disclosure - Income Taxes (Effective Tax Rate-Shareholder Activism-Related Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesCashPaidforTaxesNetofRefundsDetails" roleURI="http://www.airproducts.com/role/IncomeTaxesCashPaidforTaxesNetofRefundsDetails">
        <link:definition>9955565 - Disclosure - Income Taxes (Cash Paid for Taxes, Net of Refunds) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalInformationRelatedPartyTransactionsDetails" roleURI="http://www.airproducts.com/role/SupplementalInformationRelatedPartyTransactionsDetails">
        <link:definition>9955566 - Disclosure - Supplemental Information (Related Party Transactions) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalInformationShareholderActivismRelatedCostsDetails" roleURI="http://www.airproducts.com/role/SupplementalInformationShareholderActivismRelatedCostsDetails">
        <link:definition>9955567 - Disclosure - Supplemental Information (Shareholder Activism-Related Costs) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SupplementalInformationChangesinEstimatesDetails" roleURI="http://www.airproducts.com/role/SupplementalInformationChangesinEstimatesDetails">
        <link:definition>9955568 - Disclosure - Supplemental Information (Changes in Estimates) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentInformationNarrativeDetails" roleURI="http://www.airproducts.com/role/BusinessSegmentInformationNarrativeDetails">
        <link:definition>9955569 - Disclosure - Business Segment Information (Narrative) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentInformationScheduleofSegmentReportingInformationDetails" roleURI="http://www.airproducts.com/role/BusinessSegmentInformationScheduleofSegmentReportingInformationDetails">
        <link:definition>9955570 - Disclosure - Business Segment Information (Schedule of Segment Reporting Information) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BusinessSegmentInformationReconciliationofSegmentOperatingIncometoConsolidatedResultsDetails" roleURI="http://www.airproducts.com/role/BusinessSegmentInformationReconciliationofSegmentOperatingIncometoConsolidatedResultsDetails">
        <link:definition>9955571 - Disclosure - Business Segment Information (Reconciliation of Segment Operating Income to Consolidated Results) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="apd_A0500EuroNotesDue2028Member" abstract="true" name="A0500EuroNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A2.950NotesDue2031Member" abstract="true" name="A2.950NotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A0800EuroNotesDue2032Member" abstract="true" name="A0800EuroNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A3.250EuroNotesDue2032Member" abstract="true" name="A3.250EuroNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A4000EuroNotesDue2035Member" abstract="true" name="A4000EuroNotesDue2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A3.450NotesDue2037Member" abstract="true" name="A3.450NotesDue2037Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ShareholderActivismCosts" abstract="false" name="ShareholderActivismCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_OtherIncomeExpenseNet" abstract="false" name="OtherIncomeExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ReclassificationAdjustmentsAbstract" abstract="true" name="ReclassificationAdjustmentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="apd_TaxCutsAndJobsActOf2017TaxReformRepatriation" abstract="false" name="TaxCutsAndJobsActOf2017TaxReformRepatriation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_NoncontrollingInterestDecreaseIncreaseFromRedemptionsOrPurchaseOfInterests" abstract="false" name="NoncontrollingInterestDecreaseIncreaseFromRedemptionsOrPurchaseOfInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ConsolidatedVariableInterestEntitiesDisclosureAbstract" abstract="true" name="ConsolidatedVariableInterestEntitiesDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="apd_ScheduleOfShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="apd_NEOMGreenHydrogenProjectFinancingPrimaryMember" abstract="true" name="NEOMGreenHydrogenProjectFinancingPrimaryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_NEOMGreenHydrogenProjectFinancingWorkingCapitalMember" abstract="true" name="NEOMGreenHydrogenProjectFinancingWorkingCapitalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SaudiRiyalFacilityTwoPointZeroZeroPercentMember" abstract="true" name="SaudiRiyalFacilityTwoPointZeroZeroPercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SaudiRiyalLoanFacilityVariableRate5.02Member" abstract="true" name="SaudiRiyalLoanFacilityVariableRate5.02Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_DeDesignatedInterestRateSwapsMember" abstract="true" name="DeDesignatedInterestRateSwapsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ValueOfEngineeringProcurementAndConstructionAgreement" abstract="false" name="ValueOfEngineeringProcurementAndConstructionAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ProjectFinancingMaximumBorrowingCapacity" abstract="false" name="ProjectFinancingMaximumBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_AmountOfExpectedDebtFundingPercent" abstract="false" name="AmountOfExpectedDebtFundingPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsBeforeTax" abstract="false" name="UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsAttributableToNoncontrollingInterests" abstract="false" name="UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsAttributableToNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsAttributableToParentAfterTax" abstract="false" name="UnrealizedGainLossOnDeDesignatedCashFlowHedgingInstrumentsAttributableToParentAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_JazanIntegratedGasificationAndPowerCompanyMember" abstract="true" name="JazanIntegratedGasificationAndPowerCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_AramcoMember" abstract="true" name="AramcoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TermOfProjectAgreement" abstract="false" name="TermOfProjectAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="apd_EquityMethodInvestmentOwnershipPercentageAttributableToNoncontrollingPartner" abstract="false" name="EquityMethodInvestmentOwnershipPercentageAttributableToNoncontrollingPartner" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_WorldEnergyMember" abstract="true" name="WorldEnergyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ProjectExitCostsMember" abstract="true" name="ProjectExitCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_IncomeLossFromEquityMethodInvestmentsMember" abstract="true" name="IncomeLossFromEquityMethodInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_RestructuringChargesAttributableToParentAfterTax" abstract="false" name="RestructuringChargesAttributableToParentAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_RestructuringChargesIncludingEquityAffiliateIncome" abstract="false" name="RestructuringChargesIncludingEquityAffiliateIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_RestructuringChargesIncludingEquityAffiliateIncomeAttributableToParentAfterTax" abstract="false" name="RestructuringChargesIncludingEquityAffiliateIncomeAttributableToParentAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_RestructuringChargesAttributableToNoncontrollingInterest" abstract="false" name="RestructuringChargesAttributableToNoncontrollingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_TotalExpectedCashOutFlow" abstract="false" name="TotalExpectedCashOutFlow" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_GlobalCostReductionPlanMember" abstract="true" name="GlobalCostReductionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_OnsiteMember" abstract="true" name="OnsiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_MerchantMember" abstract="true" name="MerchantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SaleofEquipmentMember" abstract="true" name="SaleofEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_FinancingAndLeaseArrangmentMember" abstract="true" name="FinancingAndLeaseArrangmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_AmericasSegmentMember" abstract="true" name="AmericasSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_AsiaSegmentMember" abstract="true" name="AsiaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_EuropeSegmentMember" abstract="true" name="EuropeSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_MiddleEastAndIndiaSegmentMember" abstract="true" name="MiddleEastAndIndiaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_RevenueSourceConcentrationRiskMember" abstract="true" name="RevenueSourceConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_PercentSalesSupplyMode" abstract="false" name="PercentSalesSupplyMode" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_EuroDenominatedMember" abstract="true" name="EuroDenominatedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_DerivativeAverageRatePay" abstract="false" name="DerivativeAverageRatePay" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_DerivativeAverageRateReceive" abstract="false" name="DerivativeAverageRateReceive" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="apd_DerivativeDescriptionOfVariableRateBasisReceive" abstract="false" name="DerivativeDescriptionOfVariableRateBasisReceive" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="apd_CurrentPortionOfLongTermDebtMember" abstract="true" name="CurrentPortionOfLongTermDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ForwardContractsExcludedComponentMember" abstract="true" name="ForwardContractsExcludedComponentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_DisposalGroupIncludingDiscontinuedOperationAssetsCurrentMember" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationAssetsCurrentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A364DayCreditAgreementMember" abstract="true" name="A364DayCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_A2024CreditAgreementMember" abstract="true" name="A2024CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SeniorNoteOnePointFivePercentMember" abstract="true" name="SeniorNoteOnePointFivePercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SitesOnWhichFinalSettlementHasNotBeenReached" abstract="false" name="SitesOnWhichFinalSettlementHasNotBeenReached" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="apd_PaceFloridaMember" abstract="true" name="PaceFloridaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_PiedmontSouthCarolinaMember" abstract="true" name="PiedmontSouthCarolinaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_PasadenaTexasMemberMember" abstract="true" name="PasadenaTexasMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_SiteContingencyCostReviewPeriod" abstract="false" name="SiteContingencyCostReviewPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="apd_NumberOfClosedFacilities" abstract="false" name="NumberOfClosedFacilities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="apd_LongTermIncentivePlanMember" abstract="true" name="LongTermIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_PerformanceSharesInternalBasedMember" abstract="true" name="PerformanceSharesInternalBasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_PerformanceSharesMarketBasedMember" abstract="true" name="PerformanceSharesMarketBasedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_TimeBasedDeferredStockUnitMember" abstract="true" name="TimeBasedDeferredStockUnitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ExecutiveSeparationCostsMember" abstract="true" name="ExecutiveSeparationCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_MarketBasedDeferredStockUnitMember" abstract="true" name="MarketBasedDeferredStockUnitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_RestructuringChargesTaxAmount" abstract="false" name="RestructuringChargesTaxAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsNonrecurringBenefitForUSTaxOnForeignDividends" abstract="false" name="TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsNonrecurringBenefitForUSTaxOnForeignDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_ShareholderActivismCostsNetTaxBenefit" abstract="false" name="ShareholderActivismCostsNetTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="apd_LuAnCleanEnergyCompanyTransactionMember" abstract="true" name="LuAnCleanEnergyCompanyTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="apd_ShareholderActivismCostsNetOfTax" abstract="false" name="ShareholderActivismCostsNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
