The 2004 International Raiffeisen Grand Prix was a men's tennis tournament played on outdoor clay courts in Sankt Pölten, Austria, and was part of the International Series of the 2004 ATP Tour. It was the 24th edition of the tournament and was held from May 17 through May 23, 2004. Eighth-seeded Filippo Volandri won the singles title.
Filippo Volandri defeated 
Xavier Malisse 6–1, 6–4
Mariano Hood / 
Petr Pála defeated Tomáš Cibulec / Leoš Friedl 3–6, 7–5, 6–4