<?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>0001985694</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001704292</issuerCik>
      <issuerName>Zai Lab Ltd</issuerName>
      <secFileNumber>001-38205</secFileNumber>
      <issuerAddress>
        <com:street1>899 HALEI ROAD</com:street1>
        <com:street2>BUILDING B, PUDONG</com:street2>
        <com:city>SHANGHAI</com:city>
        <com:stateOrCountry>F4</com:stateOrCountry>
        <com:zipCode>201210</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>862161632588</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Chen Yajing</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>American Depositary Shares</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>240</noOfUnitsSold>
      <aggregateMarketValue>6439.34</aggregateMarketValue>
      <noOfUnitsOutstanding>421725450</noOfUnitsOutstanding>
      <approxSaleDate>11/03/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
      <acquiredDate>10/31/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>240</amountOfSecuritiesAcquired>
      <paymentDate>10/31/2025</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Yajing Chen</name>
        <address>
          <com:street1>899 Halei Road</com:street1>
          <com:street2>Building B, Pudong</com:street2>
          <com:city>Shanghai</com:city>
          <com:stateOrCountry>F4</com:stateOrCountry>
          <com:zipCode>201210</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
      <saleDate>08/08/2025</saleDate>
      <amountOfSecuritiesSold>4096</amountOfSecuritiesSold>
      <grossProceeds>139304.96</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Yajing Chen</name>
        <address>
          <com:street1>899 Halei Road</com:street1>
          <com:street2>Building B, Pudong</com:street2>
          <com:city>Shanghai</com:city>
          <com:stateOrCountry>F4</com:stateOrCountry>
          <com:zipCode>201210</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
      <saleDate>08/15/2025</saleDate>
      <amountOfSecuritiesSold>1438</amountOfSecuritiesSold>
      <grossProceeds>50931.59</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Yajing Chen</name>
        <address>
          <com:street1>899 Halei Road</com:street1>
          <com:street2>Building B, Pudong</com:street2>
          <com:city>Shanghai</com:city>
          <com:stateOrCountry>F4</com:stateOrCountry>
          <com:zipCode>201210</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
      <saleDate>10/02/2025</saleDate>
      <amountOfSecuritiesSold>456</amountOfSecuritiesSold>
      <grossProceeds>15616.68</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.</remarks>
    <noticeSignature>
      <noticeDate>11/03/2025</noticeDate>
      <signature>/s/ Joshua Schmitt, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Yajing Chen.</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
