| 2011 St. Petersburg Open | |
|---|---|
| Date | 24–31 October |
| Edition | 17th |
| Category | ATP World Tour 250 Series |
| Draw | 32S / 16D |
| Prize money | $663,750 |
| Surface | Hard / indoor |
| Location | St. Petersburg, Russia |
| Venue | Petersburg Sports and Concert Complex |
| Champions | |
| Singles | |
 Marin Čilić | |
| Doubles | |
 Colin Fleming / Ross Hutchins | |
The 2011 St. Petersburg Open was a tennis tournament played on indoor hard courts. It was the 17th edition of the St. Petersburg Open, and part of the ATP World Tour 250 Series of the 2011 ATP World Tour. It took place at the Petersburg Sports and Concert Complex in Saint Petersburg, Russia, from October 24 through October 30, 2011.