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>0001684047</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001673985</issuerCik>
        <issuerName>AdvanSix Inc.</issuerName>
        <secFileNumber>001-37774</secFileNumber>
        <issuerAddress>
          <com:street1>300 KIMBALL DRIVE</com:street1>
          <com:street2>SUITE 101</com:street2>
          <com:city>PARSIPPANY</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07054</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(973) 526-1800</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Gramm Christopher</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>2435</noOfUnitsSold>
        <aggregateMarketValue>77920.00</aggregateMarketValue>
        <noOfUnitsOutstanding>26712936</noOfUnitsOutstanding>
        <approxSaleDate>11/06/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>11/06/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Exercise of employee stock options</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2435</amountOfSecuritiesAcquired>
        <paymentDate>11/06/2024</paymentDate>
        <natureOfPayment>Broker assisted cashless exercise</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Christopher Gramm</name>
          <address>
            <com:street1>300 KIMBALL DRIVE</com:street1>
            <com:street2>SUITE 101</com:street2>
            <com:city>PARSIPPANY</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07054</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>08/23/2024</saleDate>
        <amountOfSecuritiesSold>5213</amountOfSecuritiesSold>
        <grossProceeds>156390.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Christopher Gramm</name>
          <address>
            <com:street1>300 KIMBALL DRIVE</com:street1>
            <com:street2>SUITE 101</com:street2>
            <com:city>PARSIPPANY</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07054</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>10/04/2024</saleDate>
        <amountOfSecuritiesSold>270</amountOfSecuritiesSold>
        <grossProceeds>8641.12</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>11/06/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/13/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>Christopher Gramm</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4220}]
text: 144
  0001684047
  XXXXXXXX
  LIVE
  0001673985
  AdvanSix Inc.
  001-37774
  300 KIMBALL DRIVE
  SUITE 101
  PARSIPPANY
  NJ
  07054
  (973) 526-1800
  Gramm Christopher
  Officer
  Common Stock
  Merrill Lynch
  225 Liberty St
  Floor 37
  New York
  NY
  10281
  2435
  77920.00
  26712936
  11/06/2024
  NYSE
  Common Stock
  11/06/2024
  Exercise of employee stock options
  AdvanSix Inc.
  N
  2435
  11/06/2024
  Broker assisted cashless exercise
  N
  Christopher Gramm
  300 KIMBALL DRIVE
  SUITE 101
  PARSIPPANY
  NJ
  07054
  Common Stock
  08/23/2024
  5213
  156390.00
  Christopher Gramm
  300 KIMBALL DRIVE
  SUITE 101
  PARSIPPANY
  NJ
  07054
  Common Stock
  10/04/2024
  270
  8641.12
  11/06/2024
  03/13/2024
  Christopher Gramm