Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  St Clair Joyce
 2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2007		 3. Issuer Name and Ticker or Trading Symbol
NORTHERN TRUST CORP [NTRS]
(Last)
(First)
(Middle)
50 S. LA SALLE ST.		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
04/04/2007
(Street)

CHICAGO, IL 60603		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 22,885
I
By Trust
Common Stock (1) 14,909
D
 
Common Stock 5,026 (2)
I
401(k)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right-to-buy) 09/15/2000 09/15/2008 Common Stock 2,890 $ 34.5938 D  
Employee Stock Option (right-to-buy) 05/13/2001 05/13/2009 Common Stock 4,428 $ 45.1563 D  
Employee Stock Option (right-to-buy)   (3) 05/15/2010 Common Stock 12,000 $ 70.2813 D  
Employee Stock Option (right-to-buy)   (4) 05/21/2011 Common Stock 12,000 $ 68.105 D  
Employee Stock Option (right-to-buy) 08/19/2002 02/19/2012 Common Stock 3,507 $ 53.655 D  
Employee Stock Option (right-to-buy)   (5) 05/20/2012 Common Stock 15,000 $ 52.3 D  
Employee Stock Option (right-to-buy) 08/18/2003 02/18/2013 Common Stock 5,090 $ 32.615 D  
Employee Stock Option (right-to-buy)   (6) 02/18/2013 Common Stock 16,934 $ 32.615 D  
Employee Stock Option (right-to-buy)   (7) 02/17/2014 Common Stock 20,000 $ 49.12 D  
Employee Stock Option (right-to-buy) 03/31/2005 02/15/2015 Common Stock 20,000 $ 44.465 D  
Employee Stock Option (right-to-buy)   (8) 02/21/2016 Common Stock 17,168 $ 52.095 D  
Employee Stock Option (right-to-buy)   (9) 02/20/2017 Common Stock 11,838 $ 63.36 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
St Clair Joyce
50 S. LA SALLE ST.
CHICAGO, IL 60603		       Executive Vice President  

Signatures

/s/Eileen C. Ratzka, Attorney-in-Fact, for Joyce St. Clair 04/04/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock.
(2) as of 12/31/2006
(3) This option became exercisable in three equal installments beginning 5/15/2001.
(4) This option became exercisable in three equal installments beginning 5/21/2002.
(5) This option became exercisable in three equal installments beginning 5/20/2003.
(6) This option became exercisable in three equal installments beginning 2/18/2004.
(7) This option became exercisable in four equal installments beginning 2/17/2005.
(8) This option became exercisable in four equal installments beginning 2/21/2007.
(9) This option becomes exercisable in four equal installments beginning 2/20/2008.

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