The 2004 BA-CA-TennisTrophy was a tennis tournament played on indoor hard courts. It was the 30th edition of the event known that year as the BA-CA-TennisTrophy, and was part of the International Series Gold of the 2004 ATP Tour. It took place at the Wiener Stadthalle in Vienna, Austria, from October 11 through October 17, 2004.

Feliciano López defeated Guillermo Cañas 6–4, 1–6, 7–5, 3–6, 7–5

Martin Damm / Cyril Suk defeated Gastón Etlis / Martín Rodríguez 6–7^(4–7), 6–4, 7–6^(7–4)