The 2011 Erste Bank Open was a men's tennis tournament to be played on indoor hard courts. It is the 37th edition of the event known that year as the Erste Bank Open, and part of the ATP World Tour 250 Series of the 2011 ATP World Tour. It is held at the Wiener Stadthalle in Vienna, Austria, from 25 October through 30 October 2011. First-seeded Jo-Wilfried Tsonga won the singles title.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Jo-Wilfried Tsonga | 9 | 1 | ||
| Juan Martín del Potro | 15 | 2 | ||
| Jürgen Melzer | 25 | 3 | ||
| Radek Štěpánek | 26 | 4 | ||
| Juan Ignacio Chela | 28 | 5 | ||
| Kevin Anderson | 31 | 6 | ||
| Nikolay Davydenko | 38 | 7 | ||
| Fabio Fognini | 39 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2011 Erste Bank Open – Singles qualifying.
See main article: 2011 Erste Bank Open – Singles. 
Jo-Wilfried Tsonga defeated 
Juan Martín del Potro, 6–7(5–7), 6–3, 6–4
See main article: 2011 Erste Bank Open – Doubles. 
Bob Bryan / Mike Bryan defeated 
Max Mirnyi / 
Daniel Nestor, 7–6(12–10), 6–3
