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

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2010-09-17</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001108185</issuerCik>
        <issuerName>OCCAM NETWORKS INC/DE</issuerName>
        <issuerTradingSymbol>OCNW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001502021</rptOwnerCik>
            <rptOwnerName>Sheeler Derek Kent</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>36 FOLIAGE VIEW RD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LEBANON</rptOwnerCity>
            <rptOwnerState>NH</rptOwnerState>
            <rptOwnerZipCode>03766</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common stock, par value $0.001 (the &quot;Common Stock&quot;)</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>556570</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>As more fully disclosed in the Schedule 13D filed by Derek Sheeler with the Securities and Exchange Commission on September 27, 2010 (the &quot;Schedule 13D&quot;), as a result of the actions undertaken on behalf of Mr. Sheeler and the other Reporting Persons (as defined in the Schedule 13D), Mr. Sheeler may be deemed to be a member of a &quot;group&quot; for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, with the other Reporting Persons.  On information and belief, Mr. Sheeler and the other Reporting Persons collectively own more than 10% of the total outstanding Common Stock of the Issuer.  This Form 3 shall not be deemed an admission that any of the Reporting Persons is a beneficial owner of any shares of Common Stock for any purpose, other than the shares of Common Stock reported on this Form 3.  This Form 3 does not reflect any shares of Common Stock that are owned by any other Reporting Person.</remarks>

    <ownerSignature>
        <signatureName>/s/ Derek Kent Sheeler</signatureName>
        <signatureDate>2010-09-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
