N-CSR Item 12(b) - Exhibits: Certifications

                           SECTION 906 CERTIFICATION

Pursuant to 18 U.S.C.{section} 1350, the undersigned officers of FEDERATED
SHORT-TERM MUNICIPAL TRUST (the "Registrant"), hereby certify, to the best of
our knowledge, that the Registrant's Report on Form N-CSR for the period ended
June 30, 2007 (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: August 20, 2007

/s/ John B. Fisher
John B. Fisher
Title: President, Principal Executive Officer

Dated: August 20, 2007

/s/ Richard A. Novak
Richard A. Novak
Title: Treasurer, Principal Financial Officer

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