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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:51d12b74-b916-4a26-aeac-7079a22e78ba,g:4e3d12e3-cf93-48dd-92a6-46183392a19a-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:alg="http://www.alamo-group.com/20240331" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.alamo-group.com/20240331">
  <xs:import namespace="http://fasb.org/srt/2023" schemaLocation="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2023" schemaLocation="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.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/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/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/2023" schemaLocation="https://xbrl.sec.gov/country/2023/country-2023.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2023" schemaLocation="https://xbrl.sec.gov/dei/2023/dei-2023.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2023" schemaLocation="https://xbrl.sec.gov/ecd/2023/ecd-2023.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="alg-20240331_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="alg-20240331_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="alg-20240331_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="alg-20240331_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.alamo-group.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="InterimCondensedConsolidatedBalanceSheetsUnaudited" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedBalanceSheetsUnaudited">
        <link:definition>0000002 - Statement - Interim Condensed 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="InterimCondensedConsolidatedBalanceSheetsUnauditedParenthetical" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedBalanceSheetsUnauditedParenthetical">
        <link:definition>0000003 - Statement - Interim Condensed 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="InterimCondensedConsolidatedStatementsofIncomeUnaudited" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofIncomeUnaudited">
        <link:definition>0000004 - Statement - Interim Condensed Consolidated Statements of Income (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="InterimCondensedConsolidatedStatementsofComprehensiveIncomeUnaudited" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofComprehensiveIncomeUnaudited">
        <link:definition>0000005 - Statement - Interim Condensed Consolidated Statements of Comprehensive Income (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="InterimCondensedConsolidatedStatementsofComprehensiveIncomeUnauditedParenthetical" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofComprehensiveIncomeUnauditedParenthetical">
        <link:definition>0000006 - Statement - Interim Condensed Consolidated Statements of Comprehensive Income (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="InterimCondensedConsolidatedStatementsofStockholdersEquityUnaudited" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofStockholdersEquityUnaudited">
        <link:definition>0000007 - Statement - Interim Condensed Consolidated Statements of Stockholders' 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="InterimCondensedConsolidatedStatementsofStockholdersEquityUnauditedParenthetical" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofStockholdersEquityUnauditedParenthetical">
        <link:definition>0000008 - Statement - Interim Condensed Consolidated Statements of Stockholders' 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="InterimCondensedConsolidatedStatementsofCashFlowsUnaudited" roleURI="http://www.alamo-group.com/role/InterimCondensedConsolidatedStatementsofCashFlowsUnaudited">
        <link:definition>0000009 - Statement - Interim Condensed 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="BasisofFinancialStatementPresentation" roleURI="http://www.alamo-group.com/role/BasisofFinancialStatementPresentation">
        <link:definition>0000010 - Disclosure - Basis of Financial Statement Presentation</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="BusinessCombinations" roleURI="http://www.alamo-group.com/role/BusinessCombinations">
        <link:definition>0000011 - Disclosure - Business Combinations</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="AccountsReceivable" roleURI="http://www.alamo-group.com/role/AccountsReceivable">
        <link:definition>0000012 - Disclosure - Accounts Receivable</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.alamo-group.com/role/Inventories">
        <link:definition>0000013 - 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="RentalEquipment" roleURI="http://www.alamo-group.com/role/RentalEquipment">
        <link:definition>0000014 - Disclosure - Rental 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="FairValueMeasurements" roleURI="http://www.alamo-group.com/role/FairValueMeasurements">
        <link:definition>0000015 - 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="GoodwillandIntangibleAssets" roleURI="http://www.alamo-group.com/role/GoodwillandIntangibleAssets">
        <link:definition>0000016 - Disclosure - Goodwill and 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="Leases" roleURI="http://www.alamo-group.com/role/Leases">
        <link:definition>0000017 - 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="Debt" roleURI="http://www.alamo-group.com/role/Debt">
        <link:definition>0000018 - 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="CommonStockandDividends" roleURI="http://www.alamo-group.com/role/CommonStockandDividends">
        <link:definition>0000019 - Disclosure - Common Stock and Dividends</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="EarningsPerShare" roleURI="http://www.alamo-group.com/role/EarningsPerShare">
        <link:definition>0000020 - Disclosure - Earnings 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="RevenueandSegmentInformation" roleURI="http://www.alamo-group.com/role/RevenueandSegmentInformation">
        <link:definition>0000021 - Disclosure - Revenue and 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="AccumulatedOtherComprehensiveLoss" roleURI="http://www.alamo-group.com/role/AccumulatedOtherComprehensiveLoss">
        <link:definition>0000022 - 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="BasisofFinancialStatementPresentationPolicies" roleURI="http://www.alamo-group.com/role/BasisofFinancialStatementPresentationPolicies">
        <link:definition>9954471 - Disclosure - Basis of Financial Statement Presentation (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="InventoriesTables" roleURI="http://www.alamo-group.com/role/InventoriesTables">
        <link:definition>9954472 - 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="GoodwillandIntangibleAssetsTables" roleURI="http://www.alamo-group.com/role/GoodwillandIntangibleAssetsTables">
        <link:definition>9954473 - Disclosure - Goodwill and 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="LeasesTables" roleURI="http://www.alamo-group.com/role/LeasesTables">
        <link:definition>9954474 - 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="DebtTables" roleURI="http://www.alamo-group.com/role/DebtTables">
        <link:definition>9954475 - 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="CommonStockandDividendsTables" roleURI="http://www.alamo-group.com/role/CommonStockandDividendsTables">
        <link:definition>9954476 - Disclosure - Common Stock and Dividends (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="EarningsPerShareTables" roleURI="http://www.alamo-group.com/role/EarningsPerShareTables">
        <link:definition>9954477 - Disclosure - Earnings 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="RevenueandSegmentInformationTables" roleURI="http://www.alamo-group.com/role/RevenueandSegmentInformationTables">
        <link:definition>9954478 - Disclosure - Revenue and 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="AccumulatedOtherComprehensiveLossTables" roleURI="http://www.alamo-group.com/role/AccumulatedOtherComprehensiveLossTables">
        <link:definition>9954479 - 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="BusinessCombinationsDetails" roleURI="http://www.alamo-group.com/role/BusinessCombinationsDetails">
        <link:definition>9954480 - Disclosure - Business Combinations (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="AccountsReceivableDetails" roleURI="http://www.alamo-group.com/role/AccountsReceivableDetails">
        <link:definition>9954481 - Disclosure - Accounts Receivable (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="InventoriesScheduleofInventoriesDetails" roleURI="http://www.alamo-group.com/role/InventoriesScheduleofInventoriesDetails">
        <link:definition>9954482 - Disclosure - Inventories - Schedule of 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="InventoriesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/InventoriesAdditionalInformationDetails">
        <link:definition>9954483 - Disclosure - Inventories - Additional 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="RentalEquipmentDetails" roleURI="http://www.alamo-group.com/role/RentalEquipmentDetails">
        <link:definition>9954484 - Disclosure - Rental 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="GoodwillandIntangibleAssetsGoodwillDetails" roleURI="http://www.alamo-group.com/role/GoodwillandIntangibleAssetsGoodwillDetails">
        <link:definition>9954485 - Disclosure - Goodwill and Intangible Assets - 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="GoodwillandIntangibleAssetsScheduleofDefiniteandIndefiniteLivedIntangibleAssetsDetails" roleURI="http://www.alamo-group.com/role/GoodwillandIntangibleAssetsScheduleofDefiniteandIndefiniteLivedIntangibleAssetsDetails">
        <link:definition>9954486 - Disclosure - Goodwill and Intangible Assets - Schedule of Definite and Indefinite Lived 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="GoodwillandIntangibleAssetsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/GoodwillandIntangibleAssetsAdditionalInformationDetails">
        <link:definition>9954487 - Disclosure - Goodwill and Intangible Assets - Additional 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="LeasesLeaseCostDetails" roleURI="http://www.alamo-group.com/role/LeasesLeaseCostDetails">
        <link:definition>9954488 - Disclosure - Leases - Lease 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="LeasesMaturityScheduleDetails" roleURI="http://www.alamo-group.com/role/LeasesMaturityScheduleDetails">
        <link:definition>9954489 - Disclosure - Leases - Maturity Schedule (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="LeasesMaturityScheduleDetails_1" roleURI="http://www.alamo-group.com/role/LeasesMaturityScheduleDetails_1">
        <link:definition>9954489 - Disclosure - Leases - Maturity Schedule (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="LeasesAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesAdditionalInformationDetails">
        <link:definition>9954490 - Disclosure - Leases - Additional 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="LeasesSupplementalBalanceSheetInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesSupplementalBalanceSheetInformationDetails">
        <link:definition>9954491 - Disclosure - Leases - Supplemental Balance Sheet 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="LeasesSupplementalCashFlowInformationDetails" roleURI="http://www.alamo-group.com/role/LeasesSupplementalCashFlowInformationDetails">
        <link:definition>9954492 - Disclosure - Leases - 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="DebtScheduleofComponentsofLongTermDebtDetails" roleURI="http://www.alamo-group.com/role/DebtScheduleofComponentsofLongTermDebtDetails">
        <link:definition>9954493 - Disclosure - Debt - Schedule of Components 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="DebtAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/DebtAdditionalInformationDetails">
        <link:definition>9954494 - Disclosure - Debt - Additional 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="CommonStockandDividendsDividendDeclaredandPaidDetails" roleURI="http://www.alamo-group.com/role/CommonStockandDividendsDividendDeclaredandPaidDetails">
        <link:definition>9954495 - Disclosure - Common Stock and Dividends - Dividend Declared and 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="CommonStockandDividendsAdditionalInformationDetails" roleURI="http://www.alamo-group.com/role/CommonStockandDividendsAdditionalInformationDetails">
        <link:definition>9954496 - Disclosure - Common Stock and Dividends - Additional 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="EarningsPerShareCalculationofBasicandDilutedEPSDetails" roleURI="http://www.alamo-group.com/role/EarningsPerShareCalculationofBasicandDilutedEPSDetails">
        <link:definition>9954497 - Disclosure - Earnings Per Share - Calculation of Basic and Diluted EPS (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="RevenueandSegmentInformationDisaggregationofRevenueDetails" roleURI="http://www.alamo-group.com/role/RevenueandSegmentInformationDisaggregationofRevenueDetails">
        <link:definition>9954498 - Disclosure - Revenue and Segment Information - 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="RevenueandSegmentInformationRevenuebyGeographicalLocationDetails" roleURI="http://www.alamo-group.com/role/RevenueandSegmentInformationRevenuebyGeographicalLocationDetails">
        <link:definition>9954499 - Disclosure - Revenue and Segment Information - Revenue by Geographical 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="RevenueandSegmentInformationScheduleofSegmentReportingInformationbySegmentDetails" roleURI="http://www.alamo-group.com/role/RevenueandSegmentInformationScheduleofSegmentReportingInformationbySegmentDetails">
        <link:definition>9954500 - Disclosure - Revenue and Segment Information - Schedule of Segment Reporting Information, 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="AccumulatedOtherComprehensiveLossDetails" roleURI="http://www.alamo-group.com/role/AccumulatedOtherComprehensiveLossDetails">
        <link:definition>9954501 - Disclosure - Accumulated Other Comprehensive Loss (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="alg_OtherGeographicalAreasMember" abstract="true" name="OtherGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_WholegoodUnitsMember" abstract="true" name="WholegoodUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_IncreaseDecreaseInRentalEquipment" abstract="false" name="IncreaseDecreaseInRentalEquipment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="alg_ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassTable" abstract="true" name="ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="alg_AverageCommonSharesAbstract" abstract="true" name="AverageCommonSharesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_LesseeOperatingLeaseLeaseNotYetCommencedAmount" abstract="false" name="LesseeOperatingLeaseLeaseNotYetCommencedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassLineItems" abstract="true" name="ScheduleofAcquiredIndefinitelivedandFiniteIntangibleAssetsbyMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="alg_RoyalTruckMember" abstract="true" name="RoyalTruckMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="alg_SupplementalCashFlowInformationRelatedToLeasesTableTextBlock" abstract="false" name="SupplementalCashFlowInformationRelatedToLeasesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="alg_VegetationManagementSegmentMember" abstract="true" name="VegetationManagementSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_PartsMember" abstract="true" name="PartsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_SECSchedule1209SalesDiscountsMember" abstract="true" name="SECSchedule1209SalesDiscountsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="alg_IndustrialEquipmentSegmentMember" abstract="true" name="IndustrialEquipmentSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_OtherRevenueMember" abstract="true" name="OtherRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="alg_RentalEquipmentNet" abstract="false" name="RentalEquipmentNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
