For period ended 06/30/2009
Registrant Name: American Beacon Master Trust
File Number: 811-9098


EXHIBIT 99.906CERT


William F. Quinn and Rebecca L. Harris, respectively, the President and
Treasurer of the American Beacon Master Trust (the "Registrant"), each certify
to the best of his or her knowledge and belief that:

1.  the Registrant's report on Form N-CSR for the period ended June 30, 2009
(the "Form N-CSR") fully complies with the requirements of Section 15(d) of the
Securities Exchange Act of 1934, as amended; and

2.  the information contained in such Form N-CSR fairly presents, in all
material respects, the financial condition and results of operations of the
Registrant.

/s/ William F. Quinn                      /s/ Rebecca L. Harris
- ----------------------                    ---------------------
William F. Quinn                          Rebecca L. Harris
President                                 Treasurer
American Beacon Master Trust              American Beacon Master Trust

Date: September 3, 2009


A signed original of this written statement required by Section 906 has been
provided to American Beacon Master Trust and will be retained by American
Beacon Master Trust and furnished to the Securities and Exchange
Commission or its staff upon request.