<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001618972</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000771497</issuerCik>
      <issuerName>ABM INDUSTRIES INC /DE/</issuerName>
      <secFileNumber>001-08929</secFileNumber>
      <issuerAddress>
        <com:street1>ONE LIBERTY PLAZA</com:street1>
        <com:street2>7TH FLOOR</com:street2>
        <com:city>NEW YORK</com:city>
        <com:stateOrCountry>NY</com:stateOrCountry>
        <com:zipCode>10006</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>212 297-0200</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SALMIRS SCOTT B</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Merrill Lynch</name>
        <address>
          <com:street1>225 Liberty St</com:street1>
          <com:street2>Floor 37</com:street2>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10281</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>25000</noOfUnitsSold>
      <aggregateMarketValue>1250000.00</aggregateMarketValue>
      <noOfUnitsOutstanding>65532154</noOfUnitsOutstanding>
      <approxSaleDate>12/13/2023</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>11/11/2021</acquiredDate>
      <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ABM INDUSTRIES INC</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>25000</amountOfSecuritiesAcquired>
      <paymentDate>11/11/2021</paymentDate>
      <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>12/13/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>01/09/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>SCOTT SALMIRS</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
