Filed with the Securities and Exchange Commission on August 28, 2012

1933 Act Registration File No. 333-17391

1940 Act File No. 811-07959

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No. ____	¨
Post-Effective Amendment No. 450	x
and
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 452	x

(Check appropriate box or boxes.)

ADVISORS SERIES TRUST

 (Exact Name of Registrant as Specified in Charter)

615 East Michigan Street

Milwaukee, Wisconsin 53202

(Address of Principal Executive Offices) (Zip Code)

(Registrant’s Telephone Numbers, Including Area Code) (414) 765-6609

Douglas G. Hess, President

Advisors Series Trust

c/o U.S. Bancorp Fund Services, LLC

777 East Wisconsin Avenue, 5th Floor

Milwaukee, Wisconsin 53202

(Name and Address of Agent for Service)

Copies to:

Domenick Pugliese, Esq.

Paul, Hastings, Janofsky & Walker LLP

Park Avenue Tower

75 East 55th Street

New York, New York 10022

As soon as practical after the effective date of this Registration Statement

Approximate Date of Proposed Public Offering

It is proposed that this filing will become effective

¨ immediately upon filing pursuant to paragraph (b)

x on September 27, 2012 pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on __________ pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on __________ pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box

[X] this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

EXPLANATORY NOTE

Designation of New Effective Date for Previously Filed Amendment

Post-Effective Amendment No. 429 (“the “Amendment”) was filed pursuant to Rule 485(a)(2) under the Securities Act of 1933 on June 15, 2012, and pursuant to Rule 485(a)(2) would become effective on August 29, 2012.

This Post-Effective Amendment No. 450 is being filed pursuant to Rule 485(b)(1)(iii) for the sole purpose of designating September 27, 2012, as the new date upon which the Amendment shall become effective.

This Post-Effective Amendment No. 450 incorporates by reference the information contained in Parts A, B and C of the Amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act and the 1940 Act, the Registrant certifies that this Post-Effective Amendment No.450 to its Registration Statement meets all of the requirements for effectiveness under Rule 485(b) and has duly caused this Post-Effective Amendment No. 450 to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, duly authorized, in the City of Milwaukee and State of Wisconsin, on the 28th day of August, 2012.

Advisors Series Trust

By:   /s/ Douglas G. Hess

       Douglas G. Hess

       President

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment No. 450 to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
Sallie P. Diederich*	Trustee	August 28, 2012
Sallie P. Diederich
Donald E. O’Connor*	Trustee	August 28, 2012
Donald E. O’Connor
George Rebhan*	Trustee	August 28, 2012
George Rebhan
George T. Wofford*	Trustee	August 28, 2012
George T. Wofford
Joe D. Redwine*	Trustee, Chairman and	August 28, 2012
Joe D. Redwine	Chief Executive Officer
/s/ Cheryl L. King	Treasurer and	August 28, 2012
Cheryl L. King	Principal Financial Officer
/s/ Douglas G. Hess	President and	August 28, 2012
Douglas G. Hess	Principal Executive Officer
*By: /s/ Douglas G. Hess		August 28, 2012
Douglas G. Hess   Attorney-In Fact pursuant to   Power of Attorney