2003 St. Petersburg Open
| 2003 St. Petersburg Open | |
|---|---|
| Date | October 20 – October 26 |
| Edition | 9th |
| Category | International Series |
| Draw | 32S / 16D |
| Prize money | $975,000 |
| Surface | Hard / Indoor |
| Location | St. Petersburg, Russia |
| Venue | Petersburg Sports and Concert Complex |
| Champions | |
| Singles | |
 Gustavo Kuerten | |
| Doubles | |
 Julian Knowle /  Nenad Zimonjić | |
The 2003 St. Petersburg Open was a tennis tournament played on indoor hard courts at the Petersburg Sports and Concert Complex in Saint Petersburg in Russia and was part of the International Series of the 2003 ATP Tour. The tournament ran from October 20 through October 26, 2003.
Champions
Men's Singles
Gustavo Kuerten defeated 
Sargis Sargsian 6–4, 6–3
- It was Kuerten's 2nd title of the year and the 27th of his career.
Men's Doubles
Julian Knowle / Nenad Zimonjić defeated 
Michael Kohlmann / Rainer Schüttler 7–6(7–1), 6–3
- It was Knowle's 2nd title of the year and the 4th of his career. It was Zimonjić's 2nd title of the year and the 7th of his career.