2011 Kremlin Cup should not be confused with 2011 Kazan Kremlin Cup.
The 2011 Kremlin Cup was a tennis tournament played on indoor hard courts. It was the 22nd edition of the Kremlin Cup for the men (16th edition for the women) and was part of the ATP World Tour 250 Series of the 2011 ATP World Tour, and of the Premier Series of the 2011 WTA Tour. It was held at the Olympic Stadium in Moscow, Russia, from 15 October through 23 October 2011. Janko Tipsarević and Dominika Cibulková won the singles title.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Janko Tipsarević | 13 | 1 | ||
| Viktor Troicki | 16 | 2 | ||
| Alexandr Dolgopolov | 18 | 3 | ||
| Nikolay Davydenko | 37 | 4 | ||
| Alex Bogomolov Jr. | 38 | 5 | ||
| Dmitry Tursunov | 41 | 6 | ||
| Gilles Müller | 42 | 7 | ||
| Andreas Seppi | 43 | 8 |
The following players received wildcards into the singles main draw:
The following players have received the entry from the qualifying draw:
See main article: 2011 Kremlin Cup – Men's singles qualifying.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Vera Zvonareva | 5 | 1 | ||
| Agnieszka Radwańska | 8 | 2 | ||
 France | Marion Bartoli | 11 | 3 | |
 Italy | Francesca Schiavone | 12 | 4 | |
| Jelena Janković | 13 | 5 | ||
| Svetlana Kuznetsova | 19 | 6 | ||
| Roberta Vinci | 22 | 7 | ||
| Dominika Cibulková | 23 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2011 Kremlin Cup – Women's singles qualifying.
The following players received entry from a lucky loser spot:
See main article: 2011 Kremlin Cup – Men's singles. 
Janko Tipsarević defeated Viktor Troicki, 6–4, 6–2
See main article: 2011 Kremlin Cup – Women's singles. 
Dominika Cibulková defeated 
Kaia Kanepi, 3–6, 7–6(7–1), 7–5
See main article: 2011 Kremlin Cup – Men's doubles. 
František Čermák / Filip Polášek defeated 
Carlos Berlocq / 
David Marrero, 6–3, 6–1
See main article: 2011 Kremlin Cup – Women's doubles. 
Vania King / 
Yaroslava Shvedova defeated 
Anastasia Rodionova / Galina Voskoboeva, 7–6(7–3), 6–3
