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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-11-07</periodOfReport>

    <issuer>
        <issuerCik>0000104207</issuerCik>
        <issuerName>WALGREEN CO</issuerName>
        <issuerTradingSymbol>WAG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001341253</rptOwnerCik>
            <rptOwnerName>Crawford Kermit R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>108 WILMOT ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DEERFIELD</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60015</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Pharm., Health &amp; Wellness</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
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            </transactionCoding>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
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            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>30778</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                <sharesOwnedFollowingTransaction>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>66.26</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
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                <sharesOwnedFollowingTransaction>
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                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
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                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>53366</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>35.65</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>136870</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Walgreen Co. Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>53366</value>
                </transactionShares>
                <transactionPricePerShare>
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                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
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                    <footnoteId id="F2"/>
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            <ownershipNature>
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                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.11</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3745</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2013-01-14</value>
            </exerciseDate>
            <expirationDate>
                <value>2020-01-14</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3745</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>36.43</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>23552</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            </transactionAmounts>
            <exerciseDate>
                <value>2011-09-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2018-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23552</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>34.04</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>30778</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2012-09-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2019-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>30778</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>35.65</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2014-11-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>53366</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2014-09-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2021-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>53366</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.61, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.</footnote>
        <footnote id="F2">Includes shares received upon reinvestment of dividends and shares underlying restricted stock units issued in lieu of dividends (through October 31, 2014) on outstanding restricted stock units.</footnote>
        <footnote id="F3">The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.33 to $66.37, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.</footnote>
        <footnote id="F4">The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.29, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.</footnote>
        <footnote id="F5">The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.32, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.</footnote>
        <footnote id="F6">The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.34 to $66.39, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.</footnote>
    </footnotes>

    <remarks>As previously announced in August 2014, Mr. Crawford will be retiring from the Company effective December 31, 2014.</remarks>

    <ownerSignature>
        <signatureName>/s/ Mark L. Dosier, attorney-in-fact</signatureName>
        <signatureDate>2014-11-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0306
4
2014-11-07
0000104207
WALGREEN CO
WAG
0001341253
Crawford Kermit R
108 WILMOT ROAD
DEERFIELD
IL
60015
0
1
0
0
EVP, Pharm., Health & Wellness
Walgreen Co. Common Stock
2014-11-07
4
S
0
15000
66.41
D
83504
D
Walgreen Co. Common Stock
2014-11-07
4
M
0
3745
37.11
A
87249
D
Walgreen Co. Common Stock
2014-11-07
4
S
0
3745
66.36
D
83504
D
Walgreen Co. Common Stock
2014-11-07
4
M
0
23552
36.43
A
107056
D
Walgreen Co. Common Stock
2014-11-07
4
S
0
23552
66.26
D
83504
D
Walgreen Co. Common Stock
2014-11-07
4
M
0
30778
34.04
A
114282
D
Walgreen Co. Common Stock
2014-11-07
4
S
0
30778
66.26
D
83504
D
Walgreen Co. Common Stock
2014-11-07
4
M
0
53366
35.65
A
136870
D
Walgreen Co. Common Stock
2014-11-07
4
S
0
53366
66.35
D
83504
D
Employee Stock Option (right to buy)
37.11
2014-11-07
4
M
0
3745
0
D
2013-01-14
2020-01-14
Common Stock
3745
0
D
Employee Stock Option (right to buy)
36.43
2014-11-07
4
M
0
23552
0
D
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2018-09-01
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23552
0
D
Employee Stock Option (right to buy)
34.04
2014-11-07
4
M
0
30778
0
D
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2019-09-01
Common Stock
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0
D
Employee Stock Option (right to buy)
35.65
2014-11-07
4
M
0
53366
0
D
2014-09-01
2021-09-01
Common Stock
53366
0
D
The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.61, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.
Includes shares received upon reinvestment of dividends and shares underlying restricted stock units issued in lieu of dividends (through October 31, 2014) on outstanding restricted stock units.
The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.33 to $66.37, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.
The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.29, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.
The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.25 to $66.32, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.
The price reported is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $66.34 to $66.39, inclusive. The reporting person undertakes to provide to the SEC staff, the issuer, or any securityholder of the issuer, upon request, information regarding the number of shares sold at each price within the range indicated.
As previously announced in August 2014, Mr. Crawford will be retiring from the Company effective December 31, 2014.
/s/ Mark L. Dosier, attorney-in-fact
2014-11-10