2021 St. Petersburg Open
| 2021 St. Petersburg Open | |
|---|---|
| Date | October 25–31 |
| Edition | 26th |
| Category | ATP World Tour 250 Series |
| Draw | 32S / 16D |
| Prize money | $863,705 |
| Surface | Hard (indoor) |
| Location | St. Petersburg, Russia |
| Venue | Sibur Arena |
| Champions | |
| Singles | |
| Marin Čilić | |
| Doubles | |
| Jamie Murray / Bruno Soares | |
The 2021 St. Petersburg Open was a tennis tournament played on indoor hard courts. It was the 26th edition of the St. Petersburg Open, and part of the ATP World Tour 250 Series of the 2021 ATP Tour. It took place at the Sibur Arena in Saint Petersburg, Russia, from October 25 through 31, 2021.