The 2009 Warsaw Open was a women's tennis tournament played on outdoor clay courts. It was the 13th edition of the Warsaw Open, part of the Premier-level tournaments of the 2009 WTA Tour. It took place at the Legia Tennis Centre in Warsaw, Poland, from 18 May until 23 May 2009. Unseeded Alexandra Dulgheru, who entered the main draw as a qualifier, won the singles title.
See main article: 2009 Warsaw Open – Singles. 
Alexandra Dulgheru defeated 
Alona Bondarenko, 7–6(7–3), 3–6, 6–0
See main article: 2009 Warsaw Open – Doubles. 
Raquel Kops-Jones / Bethanie Mattek-Sands defeated 
Yan Zi / Zheng Jie, 6–1, 6–1
| Player | Nationality | Ranking* | Seeding | |
|---|---|---|---|---|
| Caroline Wozniacki | Denmark | 11 | 1 | |
| Agnieszka Radwańska |  Poland | 12 | 2 | |
| Zheng Jie | China | 17 | 3 | |
| Aleksandra Wozniak |  Canada | 25 | 4 | |
| Sara Errani |  Italy | 36 | 5 | |
| Daniela Hantuchová |  Slovakia | 39 | 6 | |
| Bethanie Mattek-Sands | United States | 44 | 7 | |
| Alona Bondarenko | Ukraine | 46 | 8 | |
| Tsvetana Pironkova | Bulgaria | 47 | 9 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
