| 2009 PTT Thailand Open | |
|---|---|
| Date | September 28 – October 4 |
| Edition | 7th |
| Champions | |
| Singles | |
 Gilles Simon | |
| Doubles | |
 Eric Butorac / Rajeev Ram | |
The 2009 PTT Thailand Open was a tennis tournament played on indoor hard courts. It was the 7th edition of the Thailand Open, and was part of the ATP World Tour 250 Series of the 2009 ATP World Tour. It was held at the Impact Arena in Bangkok, Thailand, from September 28 through October 4, 2009.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| FRA | Jo-Wilfried Tsonga | 7 | 1 |
| FRA | Gilles Simon | 10 | 2 |
| USA | Sam Querrey | 25 | 3 |
 SRB | Victor Troicki | 32 | 4 |
 GER | Philipp Petzschner | 35 | 5 |
 AUT | Jürgen Melzer | 39 | 6 |
| FRA | Fabrice Santoro | 40 | 7 |
| USA | John Isner | 41 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following players received entry as a lucky loser:
Gilles Simon defeated Viktor Troicki, 7–5, 6–3.
Eric Butorac / Rajeev Ram defeated 
Guillermo García López / Mischa Zverev, 7–6(7–4), 6–3.
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