N-CSR Item 11(b) - Exhibits: Certifications

                            SECTION 906 CERTIFICATION

Pursuant  to  18  U.S.C.ss.   1350,  the   undersigned   officers  of  Federated
International  Series, Inc. on behalf of: Federated  International  Equity Fund,
Federated  International Bond Fund (the  "Registrant"),  hereby certify,  to the
best of our knowledge, that the Registrant's Report on Form N-CSR for the period
ended May 31,  2004 (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:  July 22, 2004

/s/ J. Christopher Donahue

Title: President, Principal Executive Officer



Dated:  July 22, 2004

/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.