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 *   Ackerman Patricia K 2. Date of Event Requiring Statement (Month/Day/Year) 10/10/2011 3. Issuer Name and Ticker or Trading Symbol SMITH A O CORP [AOS] (Last) (First) (Middle) A. O. SMITH CORPORATION, 11270 WEST PARK PLACE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President and Treasurer 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) MILWAUKEE, WI 53224 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 424 D   Common Stock 1,098.778 (1) I By 401 (k) Plan Trust

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 Options (Right to Buy)	  (2)	  (2)	Common Stock	7,550	$ 0	D	Â
Restricted Stock Units	  (3)	  (3)	Commn Stock	2,000	$ 0	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Ackerman Patricia K A. O. SMITH CORPORATION 11270 WEST PARK PLACE MILWAUKEE, WI 53224	Â	Â	  Vice President and Treasurer	Â

Signatures

James F. Stern, Attorney-in-Fact for Patricia K. Ackerman		10/14/2011
**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)	The number of underlying securities is based on the stock fund balance of October 10, 2011. The actual number of shares issuable upon the distribution date is not determinable since the stock fund is a unitized account consisting of 97.82% company stock and 2.18% money market fund. The stock account balance reflected in this report is based on an October 10, 2011, stock fund price of $32.770 per share.
(2)	Employee stock options were granted under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3: 1,200 employee stock options were granted on 02/11/2008 and became exercisable in three annual installments of 1/3 of the award starting on 02/11/2009; 3,300 employee stock options were granted on 02/09/2009 and became exercisable in three annual installments of 1/3 of the award starting on 02/09/2010; 1,650 employee stock options were granted on 02/08/2010 and became exercisable in three annual installments of 1/3 of the award starting on 02/08/2011; 1,400 employee stock options were granted on 02/07/2011 and become exercisable in three annual installments of 1/3 of the award starting on 02/07/2012. All employee stock options expire ten years after the date of the award.
(3)	Restricted stock units were granted under the A. O. Smith Combined Incentive Compensation Plan, a transaction exempt under Rule 16b-3: 900 restricted stock units were granted on 02/09/2009; 600 restricted stock units were granted on 02/08/2010; and 500 restricted stock units were granted on 02/07/2011. The restricted stock units become payable in Common Stock on the vesting date, which is three years after the grant date. The Plan permits the participant to defer receipt of the awards, and Patricia Ackerman has made a deferral.

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