As filed with the Securities and Exchange Commission on April 29, 2016

1933 Act File No. 033-11387

1940 Act File No. 811-04984

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. 256	[ X ]
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940			[ X ]
	Amendment No. 257	[ X ]
(Check appropriate box or boxes.)

AMERICAN BEACON FUNDS

(Exact Name of Registrant as Specified in Charter)

220 East Las Colinas Boulevard, Suite 1200

Irving, Texas 75039

(Address of Principal Executive Offices) (Zip Code)

Registrant's Telephone Number, including Area Code: (817) 391-6100

Gene L. Needles, Jr., President 220 East Las Colinas  Boulevard Suite 1200 Irving, Texas 75039 (Name and Address of Agent for Service) With copies to: Kathy K. Ingber, Esq. K&L Gates LLP 1601 K Street, NW Washington, D.C. 20006-1600

It is proposed that this filing will become effective (check appropriate box)

[       ]	immediately upon filing pursuant to paragraph (b)
[  X  ]	on May 29, 2016 pursuant to paragraph (b)
[       ]	60 days after filing pursuant to paragraph (a)(1)
[       ]	on (date) pursuant to paragraph (a)(1)
[       ]	75 days after filing pursuant to paragraph (a)(2)
[       ]	on (date) 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

This Post-Effective Amendment No. 256 to the Registrant’s Registration Statement on Form N-1A is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 of the Securities Act of 1933, as amended (the “1933 Act”), solely for the purpose of delaying, until May 29, 2016, the effectiveness of the registration statement for the American Beacon GLG Total Return Fund, filed in Post-Effective Amendment No. 246 (“PEA No. 246”) on February 17, 2016, pursuant to paragraph (a) of Rule 485 of the 1933 Act.  No other series of the Registrant is affected by the filing.  Since no other changes are intended to be made to PEA No. 246 by means of this filing, Parts A, B and C of PEA No. 246 are incorporated herein by reference.

PART A – PROSPECTUS

The Prospectus for the American Beacon GLG Total Return Fund is incorporated herein by reference to Part A of PEA No. 246.

PART B – STATEMENT OF ADDITIONAL INFORMATION

The Statement of Additional Information for the American Beacon GLG Total Return Fund is incorporated herein by reference to Part B of PEA No. 246.

PART C – OTHER INFORMATION

The Part C for the American Beacon GLG Total Return Fund is incorporated herein by reference to Part C of PEA No. 246.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (“1933 Act”), and the Investment Company Act of 1940, as amended, the Registrant represents that this Amendment meets all the requirements for effectiveness pursuant to Rule 485(b) under the 1933 Act and has duly caused this Post-Effective Amendment No. 256 to its Registration Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Irving and the State of Texas, on April 29, 2016.

AMERICAN BEACON FUNDS
By:	/s/ Gene L. Needles, Jr.
	Gene L. Needles, Jr.
	President

Pursuant to the requirements of the 1933 Act, this Post-Effective Amendment No. 256 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature	Title	Date
/s/ Gene L. Needles, Jr.	President (Principal Executive Officer)	April 29, 2016
Gene L. Needles, Jr.
/s/ Melinda G. Heika	Treasurer (Principal Financial Officer)	April 29, 2016
Melinda G. Heika
Gilbert G. Alvarado*	Trustee	April 29, 2016
Gilbert G. Alvarado
Joseph B. Armes*	Trustee	April 29, 2016
Joseph B. Armes
Gerard J. Arpey*	Trustee	April 29, 2016
Gerard J. Arpey
Brenda A. Cline*	Trustee	April 29, 2016
Brenda A. Cline
Eugene J. Duffy*	Trustee	April 29, 2016
Eugene J. Duffy
Thomas M. Dunning*	Trustee	April 29, 2016
Thomas M. Dunning
Alan D. Feld*	Trustee	April 29, 2016
Alan D. Feld
Richard A. Massman*	Chairman and Trustee	April 29, 2016
Richard A. Massman
Barbara J. McKenna*	Trustee	April 29, 2016
Barbara J. McKenna
R. Gerald Turner*	Trustee	April 29, 2016
R. Gerald Turner

*By /s/ Rosemary K. Behan¹

Rosemary K. Behan

Attorney-In-Fact

¹Signed pursuant to previously filed power of attorney.