| Date: | 16–23 May |
| Edition: | 29th |
| Category: | World Tour 250 series |
| Prize Money: | €398,250 |
| Draw: | 32S / 16D |
| Location: | Kitzbühel, Austria |
| Venue: | Tennis Stadium Kitzbühel |
| Surface: | Clay / outdoor |
| Champs: |  Guillermo García López[1] |
| Champd: |  Marcelo Melo / André Sá[2] |
The 2009 Interwetten Austrian Open Kitzbühel is a men's tennis tournament played on outdoor clay courts. It is the 29th edition of the tournament and was part of the World Tour 250 series of the 2009 ATP World Tour. It was held at the Tennis Stadium Kitzbühel in Kitzbühel Austria from 16 May until 23 May 2009. Unseeded Guillermo García López won the singles title.
| Player | Nationality | Ranking* | Seeding | |
|---|---|---|---|---|
| Nikolay Davydenko |  Russia | 11 | 1 | |
| Jürgen Melzer |  Austria | 27 | 2 | |
| Victor Hănescu |  Romania | 33 | 3 | |
| Fabrice Santoro |  France | 43 | 4 | |
| Martín Vassallo Argüello |  Argentina | 49 | 5 | |
| Marc Gicquel | France | 50 | 6 | |
| Mikhail Youzhny | Russia | 52 | 7 | |
| Dudi Sela |  Israel | 57 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
Nicolás Lapentti
Robin Vik Juan Ignacio Chela Rubén Ramírez Hidalgo (lucky loser replacing Robert Kendrick) Julien Benneteau (lucky loser replacing Nicolas Devilder)See main article: 2009 Interwetten Austrian Open Kitzbühel – Singles. Guillermo García López defeated Julien Benneteau, 3–6, 7–6(7–1), 6–3
See main article: 2009 Interwetten Austrian Open Kitzbühel – Doubles. Marcelo Melo / André Sá defeated Andrei Pavel / Horia Tecău, 6–7(9–11), 6–2, [10–7]