<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000006281</issuerCik>
        <issuerName>ANALOG DEVICES INC</issuerName>
        <issuerTradingSymbol>ADI</issuerTradingSymbol>
    </issuer>

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            <rptOwnerCik>0000900729</rptOwnerCik>
            <rptOwnerName>STATA RAY</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE ANALOG WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WILMINGTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01887</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <sharesOwnedFollowingTransaction>
                    <value>120696</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Comm Stock - $.16-2/3 value</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>652221</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Mrs. Stata Directly</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">These shares were sold pursuant to a 10b5-1 plan adopted by the Reporting Person on January 9, 2025.</footnote>
        <footnote id="F2">These shares were disposed of in multiple transactions at actual sales prices ranging from $312.695 to $313.665 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F3">These shares were disposed of in multiple transactions at actual sales prices ranging from $313.905 to $314.905 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F4">These shares were disposed of in multiple transactions at actual sales prices ranging from $314.92 to $315.805 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F5">These shares were disposed of in multiple transactions at actual sales prices ranging from $316.075 to $316.87 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F6">These shares were disposed of in multiple transactions at actual sales prices ranging from $317.16 to $317.975 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F7">These shares were disposed of in multiple transactions at actual sales prices ranging from $318.22 to $318.27 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F8">These shares were disposed of in multiple transactions at actual sales prices ranging from $319.275 to $320.275 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F9">These shares were disposed of in multiple transactions at actual sales prices ranging from $320.475 to $321.46 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F10">These shares were disposed of in multiple transactions at actual sales prices ranging from $321.48 to $322.10 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F11">These shares were disposed of in multiple transactions at actual sales prices ranging from $322.785 to $322.82 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F12">These shares were disposed of in multiple transactions at actual sales prices ranging from $314.67 to $315.125 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F13">These shares were disposed of in multiple transactions at actual sales prices ranging from $315.835 to $316.82 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F14">These shares were disposed of in multiple transactions at actual sales prices ranging from $316.985 to $317.965 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F15">These shares were disposed of in multiple transactions at actual sales prices ranging from $318.02 to $318.98 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F16">These shares were disposed of in multiple transactions at actual sales prices ranging from $319.285 to $320.18 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F17">These shares were disposed of in multiple transactions at actual sales prices ranging from $320.91 to $321.84 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F18">These shares were disposed of in multiple transactions at actual sales prices ranging from $322.02 to $322.885 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F19">These shares were disposed of in multiple transactions at actual sales prices ranging from $323.045 to $323.85 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F20">These shares were disposed of in multiple transactions at actual sales prices ranging from $324.07 to $324.965 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F21">These shares were disposed of in multiple transactions at actual sales prices ranging from $325.20 to $326.115 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F22">These shares were disposed of in multiple transactions at actual sales prices ranging from $326,345 to $326.585 per share. The price reported reflects the weighted average sale price for the transactions. The Reporting Person undertakes to provide upon request by the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Shelly Shaw, General Counsel, by Power of Attorney</signatureName>
        <signatureDate>2026-02-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
