<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-06-03</periodOfReport>
    <issuer>
        <issuerCik>0000200406</issuerCik>
        <issuerName>JOHNSON &amp; JOHNSON</issuerName>
        <issuerTradingSymbol>JNJ</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001189014</rptOwnerCik>
            <rptOwnerName>POON CHRISTINE A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Executive Committee Member</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common</value><footnoteId id="F1"/></securityTitle><transactionDate><value>2003-06-30</value><footnoteId id="F1"/></transactionDate><transactionCoding><transactionFormType>5</transactionFormType><transactionCode>J</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>37</value></transactionShares><transactionValue><value>0</value><footnoteId id="F1"/></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>99</value><footnoteId id="F2"/><footnoteId id="F3"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>401 (k) and ESOP Savings Plans</value></natureOfOwnership></ownershipNature></nonDerivativeSecurity><footnotes><footnote id="F1">Shares acquired under Johnson &amp;amp; Johnson's 401(k) and ESOP Savings Plans at Plan's most recent reporting date (06/30/2003).</footnote><footnote id="F2">The reporting person beneficially and directly owns 44,087 shares of Common Stock, which includes 1,201 shares acquired by reinvestment of dividends under the DRIP, previously unreported.</footnote><footnote id="F3">As previously reported, 572 shares of common stock, representing reporting person's Pro-Rata Share of Partnership's Holdings, are held by Limited Parrtnership with Family Members </footnote></footnotes><ownerSignature><signatureName>M. H. Ullmann, Attorney in Fact for C. A. Poon</signatureName><signatureDate>2003-07-01</signatureDate></ownerSignature></ownershipDocument>

