content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001967211</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
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      <issuerInfo>
        <issuerCik>0001859690</issuerCik>
        <issuerName>Arqit Quantum Inc.</issuerName>
        <secFileNumber>001-40777</secFileNumber>
        <issuerAddress>
          <com:street1>NOVA NORTH</com:street1>
          <com:street2>7 FLOOR, 11 BRESSENDEN PLACE</com:street2>
          <com:city>LONDON</com:city>
          <com:stateOrCountry>X0</com:stateOrCountry>
          <com:zipCode>SW1E 5BY</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>44 203 91 70155</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Willcocks Patrick</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>20000</noOfUnitsSold>
        <aggregateMarketValue>10272.40</aggregateMarketValue>
        <noOfUnitsOutstanding>163554269</noOfUnitsOutstanding>
        <approxSaleDate>12/14/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/30/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>311</amountOfSecuritiesAcquired>
        <paymentDate>09/30/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/03/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>401</amountOfSecuritiesAcquired>
        <paymentDate>10/03/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/04/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>359</amountOfSecuritiesAcquired>
        <paymentDate>10/04/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/05/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>384</amountOfSecuritiesAcquired>
        <paymentDate>10/05/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/06/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>382</amountOfSecuritiesAcquired>
        <paymentDate>10/06/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/07/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>379</amountOfSecuritiesAcquired>
        <paymentDate>10/07/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/03/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>341</amountOfSecuritiesAcquired>
        <paymentDate>01/03/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/04/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>319</amountOfSecuritiesAcquired>
        <paymentDate>01/04/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/05/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>345</amountOfSecuritiesAcquired>
        <paymentDate>01/05/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/06/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>354</amountOfSecuritiesAcquired>
        <paymentDate>01/06/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/09/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>321</amountOfSecuritiesAcquired>
        <paymentDate>01/09/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/10/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>333</amountOfSecuritiesAcquired>
        <paymentDate>01/10/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/11/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>344</amountOfSecuritiesAcquired>
        <paymentDate>01/11/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>04/01/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2212</amountOfSecuritiesAcquired>
        <paymentDate>04/01/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/09/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>13215</amountOfSecuritiesAcquired>
        <paymentDate>05/09/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Patrick Willcocks</name>
          <address>
            <com:street1>11 Bressenden Place</com:street1>
            <com:street2>Nova North, 7 Floor</com:street2>
            <com:city>London</com:city>
            <com:stateOrCountry>X0</com:stateOrCountry>
            <com:zipCode>SW1E 5BY</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>11/02/2023</saleDate>
        <amountOfSecuritiesSold>2540</amountOfSecuritiesSold>
        <grossProceeds>1128.01</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Patrick Willcocks</name>
          <address>
            <com:street1>11 Bressenden Place</com:street1>
            <com:street2>Nova North, 7 Floor</com:street2>
            <com:city>London</com:city>
            <com:stateOrCountry>X0</com:stateOrCountry>
            <com:zipCode>SW1E 5BY</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>10/04/2023</saleDate>
        <amountOfSecuritiesSold>2132</amountOfSecuritiesSold>
        <grossProceeds>1193.92</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Patrick Willcocks</name>
          <address>
            <com:street1>11 Bressenden Place</com:street1>
            <com:street2>Nova North, 7 Floor</com:street2>
            <com:city>London</com:city>
            <com:stateOrCountry>X0</com:stateOrCountry>
            <com:zipCode>SW1E 5BY</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>10/03/2023</saleDate>
        <amountOfSecuritiesSold>1990</amountOfSecuritiesSold>
        <grossProceeds>1159.37</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Patrick Willcocks</name>
          <address>
            <com:street1>11 Bressenden Place</com:street1>
            <com:street2>Nova North, 7 Floor</com:street2>
            <com:city>London</com:city>
            <com:stateOrCountry>X0</com:stateOrCountry>
            <com:zipCode>SW1E 5BY</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>10/02/2023</saleDate>
        <amountOfSecuritiesSold>2089</amountOfSecuritiesSold>
        <grossProceeds>1236.06</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/14/2023</noticeDate>
        <signature>/S/ Adam Gehring, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Patrick Willcocks</signature>
      </noticeSignature>
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metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 12976}]
text: 144
  0001967211
  XXXXXXXX
  LIVE
  0001859690
  Arqit Quantum Inc.
  001-40777
  NOVA NORTH
  7 FLOOR, 11 BRESSENDEN PLACE
  LONDON
  X0
  SW1E 5BY
  44 203 91 70155
  Willcocks Patrick
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  20000
  10272.40
  163554269
  12/14/2023
  NASDAQ
  Common
  09/30/2022
  Restricted Stock Vesting
  Issuer
  N
  311
  09/30/2022
  Compensation
  Common
  10/03/2022
  Restricted Stock Vesting
  Issuer
  N
  401
  10/03/2022
  Compensation
  Common
  10/04/2022
  Restricted Stock Vesting
  Issuer
  N
  359
  10/04/2022
  Compensation
  Common
  10/05/2022
  Restricted Stock Vesting
  Issuer
  N
  384
  10/05/2022
  Compensation
  Common
  10/06/2022
  Restricted Stock Vesting
  Issuer
  N
  382
  10/06/2022
  Compensation
  Common
  10/07/2022
  Restricted Stock Vesting
  Issuer
  N
  379
  10/07/2022
  Compensation
  Common
  01/03/2023
  Restricted Stock Vesting
  Issuer
  N
  341
  01/03/2023
  Compensation
  Common
  01/04/2023
  Restricted Stock Vesting
  Issuer
  N
  319
  01/04/2023
  Compensation
  Common
  01/05/2023
  Restricted Stock Vesting
  Issuer
  N
  345
  01/05/2023
  Compensation
  Common
  01/06/2023
  Restricted Stock Vesting
  Issuer
  N
  354
  01/06/2023
  Compensation
  Common
  01/09/2023
  Restricted Stock Vesting
  Issuer
  N
  321
  01/09/2023
  Compensation
  Common
  01/10/2023
  Restricted Stock Vesting
  Issuer
  N
  333
  01/10/2023
  Compensation
  Common
  01/11/2023
  Restricted Stock Vesting
  Issuer
  N
  344
  01/11/2023
  Compensation
  Common
  04/01/2023
  Restricted Stock Vesting
  Issuer
  N
  2212
  04/01/2023
  Compensation
  Common
  05/09/2023
  Stock Option Exercise
  Issuer
  N
  13215
  05/09/2023
  Cash
  N
  Patrick Willcocks
  11 Bressenden Place
  Nova North, 7 Floor
  London
  X0
  SW1E 5BY
  Common
  11/02/2023
  2540
  1128.01
  Patrick Willcocks
  11 Bressenden Place
  Nova North, 7 Floor
  London
  X0
  SW1E 5BY
  Common
  10/04/2023
  2132
  1193.92
  Patrick Willcocks
  11 Bressenden Place
  Nova North, 7 Floor
  London
  X0
  SW1E 5BY
  Common
  10/03/2023
  1990
  1159.37
  Patrick Willcocks
  11 Bressenden Place
  Nova North, 7 Floor
  London
  X0
  SW1E 5BY
  Common
  10/02/2023
  2089
  1236.06
  12/14/2023
  /S/ Adam Gehring, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Patrick Willcocks