The 2005 BA-CA-TennisTrophy was a tennis tournament played on indoor hard courts. It was the 31st edition of the event known that year as the BA-CA-TennisTrophy, and was part of the International Series Gold of the 2005 ATP Tour. It took place at the Wiener Stadthalle in Vienna, Austria, from October 10 through October 16, 2005.
Ivan Ljubičić def. Juan Carlos Ferrero, 6–2, 6–4, 7–6(7–5)
- It was Ivan Ljubičić's 2nd title of the year, and his 3rd overall.
Mark Knowles / Daniel Nestor def. Jonathan Erlich / Andy Ram, 5–3, 5–4(7–4)