As filed with the U.S. Securities and Exchange Commission on February 17, 2011

Securities Act File No. 333-162441

Investment Company Act File No. 811-22338

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. 12	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940 Amendment No. 13 (Check appropriate box or boxes) x

Legg Mason Global Asset Management Trust

(Exact Name of Registrant as Specified in Charter)

100 International Drive, Baltimore, MD	21202
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, including Area Code (800) 451-2010

Richard M. Wachterman, Esq.

Legg Mason & Co., LLC

100 International Drive

Baltimore, MD 21202

(Name and Address of Agent for Service)

COPY TO:

Arthur C. Delibert, Esq.

K&L Gates LLP

1601 K Street, N.W.

Washington, D.C. 20006

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on              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:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This filing relates solely to Legg Mason BW Diversified Large Cap Value Fund, Legg Mason Manager Select Large Cap Growth Fund and Legg Mason Manager Select Large Cap Value Fund.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”), and the Investment Company Act of 1940, as amended, the Registrant, LEGG MASON GLOBAL ASSET MANAGEMENT TRUST, hereby certifies that it meets all the requirements for effectiveness of this Post-Effective Amendment No. 12 to its Registration Statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Baltimore, State of Maryland on this 16th day of February, 2011.

LEGG MASON GLOBAL ASSET MANAGEMENT TRUST, on behalf of Legg Mason BW Diversified Large Cap Value Fund, Legg Mason Manager Select Large Cap Growth Fund and Legg Mason Manager Select Large Cap Value Fund

By:	/s/ R. Jay Gerken
	R. Jay Gerken
	Acting President

WITNESS our hands on the date set forth below.

Pursuant to the requirements of the Securities Act, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated below on February 16, 2011.

Signature	Title
/s/ Mark R. Fetting*	Chairman and Trustee
Mark R. Fetting
/s/ R. Jay Gerken	Acting President and Chief Executive Officer
R. Jay Gerken	(Principal Executive Officer)
/s/ Ruby P. Hearn*	Trustee
Ruby P. Hearn
/s/ Arnold L. Lehman *	Trustee
Arnold L. Lehman
/s/ Robin J.W. Masters *	Trustee
Robin J.W. Masters
/s/ Jill E. McGovern*	Trustee
Jill E. McGovern
/s/ Arthur S. Mehlman *	Trustee
Arthur S. Mehlman
/s/ G. Peter O’Brien *	Trustee
G. Peter O’Brien
/s/ S. Ford Rowan*	Trustee
S. Ford Rowan

/s/ Robert M. Tarola *	Trustee
Robert M. Tarola
/s/ Kaprel Ozsolak	Chief Financial Officer
Kaprel Ozsolak	(Principal Financial and Accounting Officer)

* By:	/s/ Richard M. Wachterman
	Richard M. Wachterman

Attorney in Fact, pursuant to Power of Attorney filed herewith.

POWER OF ATTORNEY

I, the undersigned Director/Trustee of one or more of the following investment companies (as set forth in the companies’ Registration Statements on Form N-1A):

LEGG MASON INCOME TRUST, INC.	LEGG MASON CHARLES STREET TRUST, INC.
LEGG MASON GLOBAL TRUST, INC.	LEGG MASON GLOBAL ASSET MANAGEMENT TRUST
LEGG MASON TAX-FREE INCOME FUND	LEGG MASON INVESTORS TRUST, INC.
LEGG MASON CAPITAL MANAGEMENT GROWTH TRUST, INC.	LEGG MASON LIGHT STREET TRUST, INC.
LEGG MASON CAPITAL MANAGEMENT VALUE TRUST, INC.	LEGG MASON INVESTMENT TRUST, INC.
LEGG MASON CAPITAL MANAGEMENT SPECIAL INVESTMENT TRUST, INC.

plus any other investment company for which Legg Mason Partners Fund Advisor, LLC or an affiliate thereof acts as investment adviser or manager and for which the undersigned individual serves as Director/Trustee hereby severally constitute and appoint each of MARK R. FETTING, DAVID R. ODENATH, R. JAY GERKEN, KAPREL OZSOLAK, ROBERT I. FRENKEL, RICHARD M. WACHTERMAN, THOMAS C. MANDIA, MARC A. DE OLIVERIA, MICHAEL KOCUR, ARTHUR C. DELIBERT and NDENISARYA M. BREGASI my true and lawful attorney-in-fact, with full power of substitution, and each with full power to sign for me and in my name in the appropriate capacity and only for those companies described above for which I serve as Director/Trustee, any Registration Statements on Form N-1A, all Pre-Effective Amendments to any Registration Statements of the Funds, any and all Post-Effective Amendments to said Registration Statements, and any and all supplements or other instruments in connection therewith, to file the same with the Securities and Exchange Commission and the securities regulators of appropriate states and territories, and generally to do all such things in my name and behalf in connection therewith as said attorney-in-fact deems necessary or appropriate to comply with the provisions of the Securities Act of 1933 and the Investment Company Act of 1940, all related requirements of the Securities and Exchange Commission and all requirements of appropriate states and territories. I hereby ratify and confirm all that said attorney-in-fact or their substitutes may do or cause to be done by virtue hereof.

Any subsequently executed power of attorney that grants powers unrelated to the powers granted herein will not revoke nor supersede this power of attorney unless such subsequent power of attorney expressly states otherwise.

WITNESS my hand on the date set forth below at Baltimore, Maryland.

SIGNATURE	DATE
/s/ Mark R. Fetting	February 24, 2010
Mark R. Fetting
/s/ David R. Odenath	February 24, 2010
David R. Odenath
/s/ Ruby P. Hearn	February 24, 2010
Ruby P. Hearn
/s/ Arnold L. Lehman	February 24, 2010
Arnold L. Lehman
/s/ Robin J.W. Masters	February 24, 2010
Robin J.W. Masters

/s/ Jill E. McGovern	February 24, 2010
Jill E. McGovern
/s/ Arthur S. Mehlman	February 24, 2010
Arthur S. Mehlman
/s/ Jennifer W. Murphy	February 24, 2010
Jennifer W. Murphy
/s/ G. Peter O’Brien	February 24, 2010
G. Peter O’Brien
/s/ S. Ford Rowan	February 24, 2010
S. Ford Rowan
/s/ Robert M. Tarola	February 24, 2010
Robert M. Tarola

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase