content: <?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>0001671755</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000016040</issuerCik>
        <issuerName>CABOT CORP</issuerName>
        <secFileNumber>001-05667</secFileNumber>
        <issuerAddress>
          <com:street1>TWO SEAPORT LANE SUITE 1400</com:street1>
          <com:city>BOSTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02210</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>6173450100</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kalkstein Hobart</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>5457</noOfUnitsSold>
        <aggregateMarketValue>548880.08</aggregateMarketValue>
        <noOfUnitsOutstanding>54823821</noOfUnitsOutstanding>
        <approxSaleDate>08/20/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/20/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Options Granted - 11/13/2020</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>5457</amountOfSecuritiesAcquired>
        <paymentDate>08/20/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Hobart Kalkstein</name>
          <address>
            <com:street1>Two Seaport Lane</com:street1>
            <com:street2>Suite 1400</com:street2>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02210-2019</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>08/19/2024</saleDate>
        <amountOfSecuritiesSold>14863</amountOfSecuritiesSold>
        <grossProceeds>1499846.14</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/20/2024</noticeDate>
        <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Hobart C. Kalkstein</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001671755
  XXXXXXXX
  LIVE
  0000016040
  CABOT CORP
  001-05667
  TWO SEAPORT LANE SUITE 1400
  BOSTON
  MA
  02210
  6173450100
  Kalkstein Hobart
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  5457
  548880.08
  54823821
  08/20/2024
  NYSE
  Common
  08/20/2024
  Options Granted - 11/13/2020
  Issuer
  N
  5457
  08/20/2024
  Cash
  N
  Hobart Kalkstein
  Two Seaport Lane
  Suite 1400
  Boston
  MA
  02210-2019
  Common
  08/19/2024
  14863
  1499846.14
  08/20/2024
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Hobart C. Kalkstein