SECTION 906 CERTIFICATION

Pursuant to 18  U.S.C.ss.  1350,  the  undersigned  officers of  Federated  GNMA
Trust(the "Registrant"),  hereby certify, to the best of our knowledge, that the
Registrant's  Report on Form N-CSR for the period  ended  January  31, 2005 (the
"Report")  fully complies with the  requirements  of Section 13(a) or 15(d),  as
applicable,  of the Securities and Exchange Act of 1934 and that the information
contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the Registrant.


Dated: March 23, 2005

/s/ J. Christopher Donahue

Title: President, Principal Executive Officer



Dated: March 23, 2005

/s/ Richard J. Thomas

Title: Treasurer, Principal Financial Officer

This  certification is being furnished solely pursuant to 18 U.S.C.ss.  1350 and
is not being filed as part of the Report or as a separate disclosure document.