<?xml version="1.0"?><ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-08-01</periodOfReport><notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0001031283</issuerCik>
        <issuerName>ENTRUST INC</issuerName>
        <issuerTradingSymbol>ENTU</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001220321</rptOwnerCik>
            <rptOwnerName>SCHLOSS DOUGLAS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ENTRUST, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>16633 DALLAS PARKWAY, SUITE 800</rptOwnerStreet2>
            <rptOwnerCity>ADDISON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75001</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-08-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>1500</value><footnoteId id="F3"/></transactionShares><transactionPricePerShare><value>3.20</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>1500</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>6000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>See footnote 1.</value><footnoteId id="F1"/></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>324500</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>See footnote 2.</value><footnoteId id="F2"/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><footnotes><footnote id="F1">These shares are held in trust for the benefit of Mr. Schloss's daughters with his wife as trustee.  Mr. Schloss disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.</footnote><footnote id="F2">These shares are held of record by Marcus Schloss &amp; Co., Inc., a registered broker-dealer, of which Mr. Schloss is the Chief Executive Officer.  Mr. Schloss shares voting and investment power with respect to those shares with certain other shareholders of Marcus Schloss &amp; Co.</footnote><footnote id="F3">Seven hundred fifty shares of common stock received were issued with restrictions that will expire on 8/1/2004.  The remaining seven hundred fifty shares were issued without any restrictions.</footnote></footnotes><ownerSignature><signatureName>James D. Kendry by power of attorney on behalf of Douglas Schloss</signatureName><signatureDate>2003-08-05</signatureDate></ownerSignature></ownershipDocument>



