Filed with the Securities and Exchange Commission on May 10, 2011

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.  364	x
and
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No.   366	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 May 27, 2011 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. 348 (“the “Amendment”) was filed pursuant to Rule 485(a)(2) under the Securities Act of 1933 on February 25, 2011, and pursuant to Rule 485(a)(2) would become effective on May 11, 2011.

This Post-Effective Amendment No. 364 is being filed pursuant to Rule 485(b)(1)(iii) for the sole purpose of designating May 27, 2011, as the new date upon which the Amendment shall become effective.

This Post-Effective Amendment No. 364 incorporates by reference the information contained in Parts A, B and C of the Amendment.