<?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>0001578147</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001114995</issuerCik>
      <issuerName>IMPINJ INC</issuerName>
      <secFileNumber>001-37824</secFileNumber>
      <issuerAddress>
        <com:street1>400 FAIRVIEW AVENUE NORTH</com:street1>
        <com:street2>SUITE 1200</com:street2>
        <com:city>SEATTLE</com:city>
        <com:stateOrCountry>WA</com:stateOrCountry>
        <com:zipCode>98109</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>206-517-5300</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>DOSSETT JEFFREY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co., Inc.</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3500</noOfUnitsSold>
      <aggregateMarketValue>358959.00</aggregateMarketValue>
      <noOfUnitsOutstanding>26650912</noOfUnitsOutstanding>
      <approxSaleDate>06/01/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/11/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Performance Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>IMPINJ, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>692</amountOfSecuritiesAcquired>
      <paymentDate>02/11/2022</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/15/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>IMPINJ, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1169</amountOfSecuritiesAcquired>
      <paymentDate>03/15/2022</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>04/12/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>IMPINJ, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1639</amountOfSecuritiesAcquired>
      <paymentDate>04/12/2022</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>03/01/2023</saleDate>
      <amountOfSecuritiesSold>3500</amountOfSecuritiesSold>
      <grossProceeds>465922.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>03/16/2023</saleDate>
      <amountOfSecuritiesSold>717</amountOfSecuritiesSold>
      <grossProceeds>93052.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>03/24/2023</saleDate>
      <amountOfSecuritiesSold>1553</amountOfSecuritiesSold>
      <grossProceeds>198279.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>04/03/2023</saleDate>
      <amountOfSecuritiesSold>3500</amountOfSecuritiesSold>
      <grossProceeds>472924.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>04/13/2023</saleDate>
      <amountOfSecuritiesSold>495</amountOfSecuritiesSold>
      <grossProceeds>66543.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>JEFFREY DOSSETT</name>
        <address>
          <com:street1>400 Fairview Avenue North, Suite 1200,</com:street1>
          <com:city>Seattle</com:city>
          <com:stateOrCountry>WA</com:stateOrCountry>
          <com:zipCode>98109</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>IMPINJ, INC.</securitiesClassTitle>
      <saleDate>05/01/2023</saleDate>
      <amountOfSecuritiesSold>4141</amountOfSecuritiesSold>
      <grossProceeds>363855.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/01/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>10/28/2022</planAdoptionDate>
      </planAdoptionDates>
      <signature>JEFFREY DOSSETT</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 7619}]
144
0001578147
XXXXXXXX
LIVE
0001114995
IMPINJ INC
001-37824
400 FAIRVIEW AVENUE NORTH
SUITE 1200
SEATTLE
WA
98109
206-517-5300
DOSSETT JEFFREY
Officer
Common
Charles Schwab & Co., Inc.
3000 Schwab Way
Westlake
TX
76262
3500
358959.00
26650912
06/01/2023
NASDAQ
Common
02/11/2022
Performance Stock Lapse
IMPINJ, INC.
N
692
02/11/2022
Equity Compensation
Common
03/15/2022
Restricted Stock Lapse
IMPINJ, INC.
N
1169
03/15/2022
Equity Compensation
Common
04/12/2022
Restricted Stock Lapse
IMPINJ, INC.
N
1639
04/12/2022
Equity Compensation
N
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
03/01/2023
3500
465922.00
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
03/16/2023
717
93052.00
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
03/24/2023
1553
198279.00
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
04/03/2023
3500
472924.00
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200
Seattle
WA
98109
IMPINJ, INC.
04/13/2023
495
66543.00
JEFFREY DOSSETT
400 Fairview Avenue North, Suite 1200,
Seattle
WA
98109
IMPINJ, INC.
05/01/2023
4141
363855.00
06/01/2023
10/28/2022
JEFFREY DOSSETT