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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:df6bbebc-edd1-40a7-9d88-5c106dfea99d,g:6a8e2597-e3c4-4623-9a4a-f747ebdf0948-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:aos="http://www.aosmith.com/20251231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.aosmith.com/20251231">
  <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.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.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/currency/2025" schemaLocation="https://xbrl.sec.gov/currency/2025/currency-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af-sub/2025" schemaLocation="https://xbrl.sec.gov/cyd/2025/cyd-af-sub-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="aos-20251231_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="aos-20251231_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="aos-20251231_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="aos-20251231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.aosmith.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</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="AuditInformation" roleURI="http://www.aosmith.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit 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="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.aosmith.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</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="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.aosmith.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (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="CONSOLIDATEDSTATEMENTSOFEARNINGS" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFEARNINGS">
        <link:definition>9952153 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS</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="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGS" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGS">
        <link:definition>9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS</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="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGSParenthetical" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEEARNINGSParenthetical">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (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="CONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</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="CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY">
        <link:definition>9952157 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS&#8217; EQUITY</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="CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYParenthetical" roleURI="http://www.aosmith.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYParenthetical">
        <link:definition>9952158 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS&#8217; EQUITY (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="OrganizationandSignificantAccountingPolicies" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPolicies">
        <link:definition>9952159 - Disclosure - Organization and Significant 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="RevenueRecognition" roleURI="http://www.aosmith.com/role/RevenueRecognition">
        <link:definition>9952160 - 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="Acquisitions" roleURI="http://www.aosmith.com/role/Acquisitions">
        <link:definition>9952161 - Disclosure - Acquisitions</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="Leases" roleURI="http://www.aosmith.com/role/Leases">
        <link:definition>9952162 - Disclosure - Leases</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="RestructuringandImpairmentExpenses" roleURI="http://www.aosmith.com/role/RestructuringandImpairmentExpenses">
        <link:definition>9952163 - Disclosure - Restructuring and Impairment Expenses</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="StatementsofCashFlows" roleURI="http://www.aosmith.com/role/StatementsofCashFlows">
        <link:definition>9952164 - Disclosure - Statements of Cash Flows</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.aosmith.com/role/Inventories">
        <link:definition>9952165 - 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="PropertyPlantandEquipment" roleURI="http://www.aosmith.com/role/PropertyPlantandEquipment">
        <link:definition>9952166 - Disclosure - Property, Plant and Equipment</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="GoodwillandOtherIntangibleAssets" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssets">
        <link:definition>9952167 - Disclosure - Goodwill and Other Intangible Assets</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.aosmith.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="StockholdersEquity" roleURI="http://www.aosmith.com/role/StockholdersEquity">
        <link:definition>9952169 - Disclosure - Stockholders' Equity</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="StockBasedCompensation" roleURI="http://www.aosmith.com/role/StockBasedCompensation">
        <link:definition>9952170 - Disclosure - Stock 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="DerivativeInstruments" roleURI="http://www.aosmith.com/role/DerivativeInstruments">
        <link:definition>9952171 - Disclosure - Derivative 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="IncomeTaxes" roleURI="http://www.aosmith.com/role/IncomeTaxes">
        <link:definition>9952172 - 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="CommitmentsandContingencies" roleURI="http://www.aosmith.com/role/CommitmentsandContingencies">
        <link:definition>9952173 - 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="OperationsbySegment" roleURI="http://www.aosmith.com/role/OperationsbySegment">
        <link:definition>9952174 - Disclosure - Operations by Segment</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="SubsequentEvents" roleURI="http://www.aosmith.com/role/SubsequentEvents">
        <link:definition>9952175 - Disclosure - Subsequent Events</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="SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTS" roleURI="http://www.aosmith.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTS">
        <link:definition>9952176 - Disclosure - SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS</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="OrganizationandSignificantAccountingPoliciesPolicies" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Organization and Significant 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="OrganizationandSignificantAccountingPoliciesTables" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesTables">
        <link:definition>9955512 - Disclosure - Organization and Significant Accounting Policies (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.aosmith.com/role/RevenueRecognitionTables">
        <link:definition>9955513 - 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="AcquisitionsTables" roleURI="http://www.aosmith.com/role/AcquisitionsTables">
        <link:definition>9955514 - Disclosure - Acquisitions (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="LeasesTables" roleURI="http://www.aosmith.com/role/LeasesTables">
        <link:definition>9955515 - Disclosure - Leases (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="RestructuringandImpairmentExpensesTables" roleURI="http://www.aosmith.com/role/RestructuringandImpairmentExpensesTables">
        <link:definition>9955516 - Disclosure - Restructuring and Impairment Expenses (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="StatementsofCashFlowsTables" roleURI="http://www.aosmith.com/role/StatementsofCashFlowsTables">
        <link:definition>9955517 - Disclosure - Statements of Cash Flows (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.aosmith.com/role/InventoriesTables">
        <link:definition>9955518 - 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="PropertyPlantandEquipmentTables" roleURI="http://www.aosmith.com/role/PropertyPlantandEquipmentTables">
        <link:definition>9955519 - Disclosure - Property, Plant and Equipment (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="GoodwillandOtherIntangibleAssetsTables" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssetsTables">
        <link:definition>9955520 - Disclosure - Goodwill and Other Intangible Assets (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="DebtTables" roleURI="http://www.aosmith.com/role/DebtTables">
        <link:definition>9955521 - Disclosure - Debt (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="StockholdersEquityTables" roleURI="http://www.aosmith.com/role/StockholdersEquityTables">
        <link:definition>9955522 - Disclosure - Stockholders' Equity (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="StockBasedCompensationTables" roleURI="http://www.aosmith.com/role/StockBasedCompensationTables">
        <link:definition>9955523 - Disclosure - Stock 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="DerivativeInstrumentsTables" roleURI="http://www.aosmith.com/role/DerivativeInstrumentsTables">
        <link:definition>9955524 - Disclosure - Derivative 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="IncomeTaxesTables" roleURI="http://www.aosmith.com/role/IncomeTaxesTables">
        <link:definition>9955525 - Disclosure - Income Taxes (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="OperationsbySegmentTables" roleURI="http://www.aosmith.com/role/OperationsbySegmentTables">
        <link:definition>9955526 - Disclosure - Operations by Segment (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="OrganizationandSignificantAccountingPoliciesNarrativeDetails" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesNarrativeDetails">
        <link:definition>9955527 - Disclosure - Organization and Significant Accounting Policies - 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="OrganizationandSignificantAccountingPoliciesCompanysProductWarrantyLiabilityActivityDetails" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesCompanysProductWarrantyLiabilityActivityDetails">
        <link:definition>9955528 - Disclosure - Organization and Significant Accounting Policies - Company's Product Warranty Liability Activity (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="OrganizationandSignificantAccountingPoliciesAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails">
        <link:definition>9955529 - Disclosure - Organization and Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on Recurring Basis (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="OrganizationandSignificantAccountingPoliciesComputationofBasicandDilutedWeightedAverageSharesUsedinEarningsperShareCalculationsDetails" roleURI="http://www.aosmith.com/role/OrganizationandSignificantAccountingPoliciesComputationofBasicandDilutedWeightedAverageSharesUsedinEarningsperShareCalculationsDetails">
        <link:definition>9955530 - Disclosure - Organization and Significant Accounting Policies - Computation of Basic and Diluted Weighted-Average Shares Used in Earnings per Share Calculations (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="RevenueRecognitionNarrativeDetails" roleURI="http://www.aosmith.com/role/RevenueRecognitionNarrativeDetails">
        <link:definition>9955531 - Disclosure - Revenue Recognition - 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="RevenueRecognitionSegmentSalesDisaggregatedbyMajorProductLineDetails" roleURI="http://www.aosmith.com/role/RevenueRecognitionSegmentSalesDisaggregatedbyMajorProductLineDetails">
        <link:definition>9955532 - Disclosure - Revenue Recognition - Segment Sales Disaggregated by Major Product Line (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="AcquisitionsNarrativeDetails" roleURI="http://www.aosmith.com/role/AcquisitionsNarrativeDetails">
        <link:definition>9955533 - Disclosure - Acquisitions - 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="AcquisitionsAllocationofFairValueofAssetsAcquiredandLiabilitiesAssumedatDateofAcquisitionDetails" roleURI="http://www.aosmith.com/role/AcquisitionsAllocationofFairValueofAssetsAcquiredandLiabilitiesAssumedatDateofAcquisitionDetails">
        <link:definition>9955534 - Disclosure - Acquisitions - Allocation of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition (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="LeasesNarrativeDetails" roleURI="http://www.aosmith.com/role/LeasesNarrativeDetails">
        <link:definition>9955535 - Disclosure - Leases - 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="LeasesSupplementalBalanceSheetDetails" roleURI="http://www.aosmith.com/role/LeasesSupplementalBalanceSheetDetails">
        <link:definition>9955536 - Disclosure - Leases - Supplemental Balance Sheet (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="LeasesComponentsofLeaseExpenseDetails" roleURI="http://www.aosmith.com/role/LeasesComponentsofLeaseExpenseDetails">
        <link:definition>9955537 - Disclosure - Leases - Components of Lease Expense (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="LeasesMaturitiesofLeaseLiabilitiesDetails" roleURI="http://www.aosmith.com/role/LeasesMaturitiesofLeaseLiabilitiesDetails">
        <link:definition>9955538 - Disclosure - Leases - Maturities of Lease 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="LeasesMaturitiesofLeaseLiabilitiesDetails_1" roleURI="http://www.aosmith.com/role/LeasesMaturitiesofLeaseLiabilitiesDetails_1">
        <link:definition>9955538 - Disclosure - Leases - Maturities of Lease 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="RestructuringandImpairmentExpensesNarrativeDetails" roleURI="http://www.aosmith.com/role/RestructuringandImpairmentExpensesNarrativeDetails">
        <link:definition>9955539 - Disclosure - Restructuring and Impairment Expenses - 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="RestructuringandImpairmentExpensesScheduleofAnalysisofCompanysRestructuringReserveDetails" roleURI="http://www.aosmith.com/role/RestructuringandImpairmentExpensesScheduleofAnalysisofCompanysRestructuringReserveDetails">
        <link:definition>9955540 - Disclosure - Restructuring and Impairment Expenses - Schedule of Analysis of Company's Restructuring Reserve (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="StatementsofCashFlowsScheduleofSupplementalCashFlowInformationDetails" roleURI="http://www.aosmith.com/role/StatementsofCashFlowsScheduleofSupplementalCashFlowInformationDetails">
        <link:definition>9955541 - Disclosure - Statements of Cash Flows - Schedule of Supplemental Cash Flow 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="StatementsofCashFlowsNarrativeDetails" roleURI="http://www.aosmith.com/role/StatementsofCashFlowsNarrativeDetails">
        <link:definition>9955542 - Disclosure - Statements of Cash Flows - 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="InventoriesDetails" roleURI="http://www.aosmith.com/role/InventoriesDetails">
        <link:definition>9955543 - Disclosure - Inventories (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="PropertyPlantandEquipmentDetails" roleURI="http://www.aosmith.com/role/PropertyPlantandEquipmentDetails">
        <link:definition>9955544 - Disclosure - Property, Plant and Equipment (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="GoodwillandOtherIntangibleAssetsScheduleofChangesinCarryingAmountofGoodwillDetails" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssetsScheduleofChangesinCarryingAmountofGoodwillDetails">
        <link:definition>9955545 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (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="GoodwillandOtherIntangibleAssetsScheduleofCarryingAmountofOtherIntangibleAssetsDetails" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssetsScheduleofCarryingAmountofOtherIntangibleAssetsDetails">
        <link:definition>9955546 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Carrying Amount of Other Intangible Assets (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="GoodwillandOtherIntangibleAssetsScheduleofCarryingAmountofOtherIntangibleAssetsDetails_1" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssetsScheduleofCarryingAmountofOtherIntangibleAssetsDetails_1">
        <link:definition>9955546 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Carrying Amount of Other Intangible Assets (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="GoodwillandOtherIntangibleAssetsNarrativeDetails" roleURI="http://www.aosmith.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails">
        <link:definition>9955547 - Disclosure - Goodwill and Other Intangible Assets - 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="DebtScheduleofDebtDetails" roleURI="http://www.aosmith.com/role/DebtScheduleofDebtDetails">
        <link:definition>9955548 - Disclosure - Debt - Schedule of Debt (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="DebtNarrativeDetails" roleURI="http://www.aosmith.com/role/DebtNarrativeDetails">
        <link:definition>9955549 - Disclosure - Debt - 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="DebtScheduleofMaturitiesofLongTermDebtDetails" roleURI="http://www.aosmith.com/role/DebtScheduleofMaturitiesofLongTermDebtDetails">
        <link:definition>9955550 - Disclosure - Debt - Schedule of Maturities of Long Term Debt (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="StockholdersEquityNarrativeDetails" roleURI="http://www.aosmith.com/role/StockholdersEquityNarrativeDetails">
        <link:definition>9955551 - Disclosure - Stockholders' Equity - 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="StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails" roleURI="http://www.aosmith.com/role/StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails">
        <link:definition>9955552 - Disclosure - Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss by Component (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="StockBasedCompensationNarrativeDetails" roleURI="http://www.aosmith.com/role/StockBasedCompensationNarrativeDetails">
        <link:definition>9955553 - Disclosure - Stock 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="StockBasedCompensationChangesinOptionAwardsAllofWhichRelatedtoCommonStockDetails" roleURI="http://www.aosmith.com/role/StockBasedCompensationChangesinOptionAwardsAllofWhichRelatedtoCommonStockDetails">
        <link:definition>9955554 - Disclosure - Stock Based Compensation - Changes in Option Awards All of Which Related to Common Stock (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="StockBasedCompensationNonvestedStockOptionsDetails" roleURI="http://www.aosmith.com/role/StockBasedCompensationNonvestedStockOptionsDetails">
        <link:definition>9955555 - Disclosure - Stock Based Compensation - Nonvested Stock Options (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="StockBasedCompensationShareUnitActivityUnderPlanDetails" roleURI="http://www.aosmith.com/role/StockBasedCompensationShareUnitActivityUnderPlanDetails">
        <link:definition>9955556 - Disclosure - Stock Based Compensation - Share Unit Activity Under 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="StockBasedCompensationPerformanceStockUnitActivityDetails" roleURI="http://www.aosmith.com/role/StockBasedCompensationPerformanceStockUnitActivityDetails">
        <link:definition>9955557 - Disclosure - Stock Based Compensation - Performance Stock Unit Activity (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="DerivativeInstrumentsNarrativeDetails" roleURI="http://www.aosmith.com/role/DerivativeInstrumentsNarrativeDetails">
        <link:definition>9955558 - Disclosure - Derivative 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="DerivativeInstrumentsContractualAmountsforDerivativesDesignatedasCashFlowHedgesDetails" roleURI="http://www.aosmith.com/role/DerivativeInstrumentsContractualAmountsforDerivativesDesignatedasCashFlowHedgesDetails">
        <link:definition>9955559 - Disclosure - Derivative Instruments - Contractual Amounts for Derivatives Designated as Cash Flow Hedges (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="DerivativeInstrumentsEffectofCashFlowHedgesontheConsolidatedStatementofEarningsDetails" roleURI="http://www.aosmith.com/role/DerivativeInstrumentsEffectofCashFlowHedgesontheConsolidatedStatementofEarningsDetails">
        <link:definition>9955560 - Disclosure - Derivative Instruments - Effect of Cash Flow Hedges on the Consolidated Statement of 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="IncomeTaxesComponentsofProvisionforIncomeTaxesDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesComponentsofProvisionforIncomeTaxesDetails">
        <link:definition>9955561 - Disclosure - Income Taxes - Components of Provision for Income Taxes (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="IncomeTaxesProvisionforBenefitfromIncomeTaxesDiffersFromTheUSFederalStatutoryRateDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesProvisionforBenefitfromIncomeTaxesDiffersFromTheUSFederalStatutoryRateDetails">
        <link:definition>9955562 - Disclosure - Income Taxes - Provision for (Benefit from) Income Taxes Differs From The U.S. Federal Statutory 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="IncomeTaxesComponentsofEarningBeforeIncomeTaxesDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesComponentsofEarningBeforeIncomeTaxesDetails">
        <link:definition>9955563 - Disclosure - Income Taxes - Components of Earning Before Income Taxes (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="IncomeTaxesIncomeTaxPaidDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesIncomeTaxPaidDetails">
        <link:definition>9955564 - Disclosure - Income Taxes - Income Tax Paid (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="IncomeTaxesNarrativeDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>9955565 - Disclosure - Income Taxes - 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="IncomeTaxesTaxEffectsofTemporaryDifferencesofAssetsandLiabilitiesDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesTaxEffectsofTemporaryDifferencesofAssetsandLiabilitiesDetails">
        <link:definition>9955566 - Disclosure - Income Taxes - Tax Effects of Temporary Differences of 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="IncomeTaxesReconciliationofNetOperatingLossesTaxCreditandValuationAllowancesDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesReconciliationofNetOperatingLossesTaxCreditandValuationAllowancesDetails">
        <link:definition>9955567 - Disclosure - Income Taxes - Reconciliation of Net Operating Losses, Tax Credit and Valuation Allowances (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="IncomeTaxesReconciliationofUnrecognizedTaxBenefitsDetails" roleURI="http://www.aosmith.com/role/IncomeTaxesReconciliationofUnrecognizedTaxBenefitsDetails">
        <link:definition>9955568 - Disclosure - Income Taxes - Reconciliation of Unrecognized Tax Benefits (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="CommitmentandContingenciesDetails" roleURI="http://www.aosmith.com/role/CommitmentandContingenciesDetails">
        <link:definition>9955569 - Disclosure - Commitment and Contingencies (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="OperationsbySegmentNarrativeDetails" roleURI="http://www.aosmith.com/role/OperationsbySegmentNarrativeDetails">
        <link:definition>9955570 - Disclosure - Operations by Segment - 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="OperationsbySegmentReportableSegmentDetails" roleURI="http://www.aosmith.com/role/OperationsbySegmentReportableSegmentDetails">
        <link:definition>9955571 - Disclosure - Operations by Segment - Reportable 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="OperationsbySegmentAssetsDepreciationAndCapitalExpenditureBySegmentDetails" roleURI="http://www.aosmith.com/role/OperationsbySegmentAssetsDepreciationAndCapitalExpenditureBySegmentDetails">
        <link:definition>9955572 - Disclosure - Operations by Segment - Assets, Depreciation And Capital Expenditure 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="OperationsbySegmentNetSalesandLongLivedAssetsbyGeographicLocationDetails" roleURI="http://www.aosmith.com/role/OperationsbySegmentNetSalesandLongLivedAssetsbyGeographicLocationDetails">
        <link:definition>9955573 - Disclosure - Operations by Segment - Net Sales and Long-Lived Assets by Geographic Location (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="SubsequentEventsDetails" roleURI="http://www.aosmith.com/role/SubsequentEventsDetails">
        <link:definition>9955574 - Disclosure - Subsequent Events (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="SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails" roleURI="http://www.aosmith.com/role/SCHEDULEIIVALUATIONANDQUALIFYINGACCOUNTSDetails">
        <link:definition>9955575 - Disclosure - SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (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="aos_CommonStockClassUndefinedMember" abstract="true" name="CommonStockClassUndefinedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_PensionSettlementIncomeExpenseNonCashTaxes" abstract="false" name="PensionSettlementIncomeExpenseNonCashTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_PaymentsForProceedsFromStockOptionsActivity" abstract="false" name="PaymentsForProceedsFromStockOptionsActivity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalShareUnitsIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_VestingOfShareUnits" abstract="false" name="VestingOfShareUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation" abstract="false" name="StockIssuedDuringPeriodValueStockIncentiveAndDirectorsCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ExciseTaxOnRepurchasesOfCommonStock" abstract="false" name="ExciseTaxOnRepurchasesOfCommonStock" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ExerciseOfStockOptionsSharesSurrenderedAsProceeds" abstract="false" name="ExerciseOfStockOptionsSharesSurrenderedAsProceeds" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="aos_ImpairmentOrDisposalOfLongLivedIntangibleAssetsImpairmentPolicyTextBlock" abstract="false" name="ImpairmentOrDisposalOfLongLivedIntangibleAssetsImpairmentPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="aos_ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" abstract="false" name="ScheduleOfSupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="aos_ScheduleOfReconciliationOfTaxLossCarryoversCreditCarryoversAndValuationAllowancesTableTableTextBlock" abstract="false" name="ScheduleOfReconciliationOfTaxLossCarryoversCreditCarryoversAndValuationAllowancesTableTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="aos_OrganizationAndSummaryOfSignificantAccountingPoliciesTable" abstract="true" name="OrganizationAndSummaryOfSignificantAccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="aos_OrganizationAndSummaryOfSignificantAccountingPoliciesLineItems" abstract="true" name="OrganizationAndSummaryOfSignificantAccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_MarketableSecuritiesMaturityPeriod" abstract="false" name="MarketableSecuritiesMaturityPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_ProductWarrantyPeriod" abstract="false" name="ProductWarrantyPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_AmortizationPeriodOfAdvertisingCosts" abstract="false" name="AmortizationPeriodOfAdvertisingCosts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_AmortizationOfAdvertisingCosts" abstract="false" name="AmortizationOfAdvertisingCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_MinimumPercentageOfAmountLikelyToBeRealizedUponUltimateSettlementToRecognizeTaxBenefits" abstract="false" name="MinimumPercentageOfAmountLikelyToBeRealizedUponUltimateSettlementToRecognizeTaxBenefits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="aos_WaterHeatersMember" abstract="true" name="WaterHeatersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_NorthAmericaSegmentMember" abstract="true" name="NorthAmericaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_RevenueFromContractWithCustomerPaymentTerms" abstract="false" name="RevenueFromContractWithCustomerPaymentTerms" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_NumberOfWholesaleDistributors" abstract="false" name="NumberOfWholesaleDistributors" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="aos_RestOfWorldMember" abstract="true" name="RestOfWorldMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_WaterHeatersAndRelatedPartsMember" abstract="true" name="WaterHeatersAndRelatedPartsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_BoilersAndRelatedPartsMember" abstract="true" name="BoilersAndRelatedPartsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_WaterTreatmentProductsMember" abstract="true" name="WaterTreatmentProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_AllOtherRestOfWorldMember" abstract="true" name="AllOtherRestOfWorldMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_PureitMember" abstract="true" name="PureitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_PrivatelyHeldWaterTreatmentCompanyMember" abstract="true" name="PrivatelyHeldWaterTreatmentCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_UnileverMember" abstract="true" name="UnileverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_BusinessCombinationContingentConsiderationContingentPaymentTerm" abstract="false" name="BusinessCombinationContingentConsiderationContingentPaymentTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_LesseeOperatingLeaseTerminationPeriod" abstract="false" name="LesseeOperatingLeaseTerminationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_RentIncentivesAndDeferrals" abstract="false" name="RentIncentivesAndDeferrals" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_AssetsLesseeAbstract" abstract="true" name="AssetsLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_OperatingLeaseTermAndDiscountRateAbstract" abstract="true" name="OperatingLeaseTermAndDiscountRateAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_TurkeyDisposalGroupMember" abstract="true" name="TurkeyDisposalGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_AssetImpairmentChargesAxis" abstract="true" name="AssetImpairmentChargesAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="aos_AssetImpairmentChargesDomain" abstract="true" name="AssetImpairmentChargesDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_ImpairmentRecordedAsNetReductionToAssetsAndLiabilitiesMember" abstract="true" name="ImpairmentRecordedAsNetReductionToAssetsAndLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_ImpairmentRecordedForAnticipatedLiquidationOfCumulativeForeignCurrencyTranslationAdjustmentRecordedInAccruedLiabilitiesMember" abstract="true" name="ImpairmentRecordedForAnticipatedLiquidationOfCumulativeForeignCurrencyTranslationAdjustmentRecordedInAccruedLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_IncomeTaxExpenseBenefitFromRestructuringCharges" abstract="false" name="IncomeTaxExpenseBenefitFromRestructuringCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_NonCashImpairmentsMember" abstract="true" name="NonCashImpairmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_RestructuringReserveNonCashAndOtherAdjustments" abstract="false" name="RestructuringReserveNonCashAndOtherAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" abstract="false" name="RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumerationNotDisclosedFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:booleanItemType"/>
  <xs:element id="aos_ScheduleOfGoodwillAndOtherIntangiblesTable" abstract="true" name="ScheduleOfGoodwillAndOtherIntangiblesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="aos_AnnuallyMember" abstract="true" name="AnnuallyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_GoodwillAndOtherIntangiblesLineItems" abstract="true" name="GoodwillAndOtherIntangiblesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_VariableRateAgreementsMember" abstract="true" name="VariableRateAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_FixedRateAgreementsMember" abstract="true" name="FixedRateAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption" abstract="false" name="LineOfCreditFacilityAccordionFeatureHigherBorrowingCapacityOption" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_LongTermDebtFixedInterestPayment" abstract="false" name="LongTermDebtFixedInterestPayment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_CommonStockVotingRightsAllowablePercentageOfBoardOfDirectorsToElect" abstract="false" name="CommonStockVotingRightsAllowablePercentageOfBoardOfDirectorsToElect" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="aos_CommonStockVotingRightsMattersOtherThanElectionOfBoardOfDirectorsVotePerShare" abstract="false" name="CommonStockVotingRightsMattersOtherThanElectionOfBoardOfDirectorsVotePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="aos_CommonStockConversionBasisRatio" abstract="false" name="CommonStockConversionBasisRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="aos_AOSmithCombinedCompensationPlanMember" abstract="true" name="AOSmithCombinedCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutPercentOfTargetAwards" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPotentialPayoutPercentOfTargetAwards" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="aos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsNonvestedWeightedAverageExercisePriceRollForward" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsNonvestedWeightedAverageExercisePriceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_CommodityFuturesContractsMember" abstract="true" name="CommodityFuturesContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_ReclassificationPeriodForEffectivePortionOfContract" abstract="false" name="ReclassificationPeriodForEffectivePortionOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="aos_UndistributedEarningsOfForeignSubsidiariesIncludingTemporarilyAndPermanentlyReinvested" abstract="false" name="UndistributedEarningsOfForeignSubsidiariesIncludingTemporarilyAndPermanentlyReinvested" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_UndistributedEarningsOfForeignSubsidiariesNotPermanentlyReinvested" abstract="false" name="UndistributedEarningsOfForeignSubsidiariesNotPermanentlyReinvested" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_PercentageOfFederalIncomeTaxLiabilityOffsetByDividendReceivedDeduction" abstract="false" name="PercentageOfFederalIncomeTaxLiabilityOffsetByDividendReceivedDeduction" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="aos_DeferredTaxAssetsAccountsReceivable" abstract="false" name="DeferredTaxAssetsAccountsReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_DeferredTaxAssetEnvironmental" abstract="false" name="DeferredTaxAssetEnvironmental" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_DeferredTaxAssetTaxLossAndCreditCarryovers" abstract="false" name="DeferredTaxAssetTaxLossAndCreditCarryovers" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ReconciliationOfNetOperatingLossesAndTaxCreditsRollForward" abstract="true" name="ReconciliationOfNetOperatingLossesAndTaxCreditsRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_NetOperatingLossesAndTaxCredits" abstract="false" name="NetOperatingLossesAndTaxCredits" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_NetOperatingLossesAndTaxCreditsChangeInBalanceAmount" abstract="false" name="NetOperatingLossesAndTaxCreditsChangeInBalanceAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ReconciliationOfValuationAllowanceDeferredTaxAssetRollForward" abstract="true" name="ReconciliationOfValuationAllowanceDeferredTaxAssetRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="aos_RepurchaseOfInventoryMember" abstract="true" name="RepurchaseOfInventoryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_MaximumAggregateProductLiabilityInsuranceCoverage" abstract="false" name="MaximumAggregateProductLiabilityInsuranceCoverage" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ProductLiabilityIndividualClaimMaximumAmount" abstract="false" name="ProductLiabilityIndividualClaimMaximumAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_DistributorRebateAccruals" abstract="false" name="DistributorRebateAccruals" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_CustomerOneMember" abstract="true" name="CustomerOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_CustomerTwoMember" abstract="true" name="CustomerTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_ReportableSegmentsMember" abstract="true" name="ReportableSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_OtherForeignMember" abstract="true" name="OtherForeignMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_LVCHoldcoLLCMember" abstract="true" name="LVCHoldcoLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="aos_BusinessCombinationConsiderationTransferredNetOfTaxBenefits" abstract="false" name="BusinessCombinationConsiderationTransferredNetOfTaxBenefits" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="aos_ValuationAllowanceForTradeAndNotesReceivableMember" abstract="true" name="ValuationAllowanceForTradeAndNotesReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
