| Date: | 26 July – 2 August |
| Edition: | 42nd |
| Category: | World Tour 250 series |
| Draw: | 28S / 16D |
| Prize Money: | €398,250 |
| Location: | Gstaad, Switzerland |
| Venue: | Roy Emerson Arena |
| Champs: |  Thomaz Bellucci |
| Champd: | Marco Chiudinelli / Michael Lammer |
The 2009 Allianz Suisse Open Gstaad was a tennis tournament played on outdoor red clay courts. It was the 42nd edition of the event known that year as the Allianz Suisse Open Gstaad and was part of the ATP World Tour 250 series of the 2009 ATP World Tour. It took place at the Roy Emerson Arena in Gstaad, Switzerland, from 26 July through 2 August 2009.[1]
| Country | Player | Rank* | Seed | |
|---|---|---|---|---|
| 18 | 1 | |||
| 24 | 2 | |||
 Russian Federation | 28 | 3 | ||
 Romania | 31 | 4 | ||
 France | 32 | 5 | ||
| 34 | 6 | |||
 Spain | 38 | 7 | ||
| France | 38 | 8 |
The following players received wildcards into the singles main draw
The following players received entry from the qualifying draw:
See main article: 2009 Allianz Suisse Open Gstaad – Singles. Thomaz Bellucci defeated Andreas Beck, 6–4, 7–6(7–2)
See main article: 2009 Allianz Suisse Open Gstaad – Doubles. Marco Chiudinelli / Michael Lammer defeated 
Jaroslav Levinský / 
Filip Polášek, 7–5, 6–3.
