The 2011 If Stockholm Open was a professional men's tennis tournament played on indoor hard courts. It was the 43rd edition of the tournament, which was part of the 2011 ATP World Tour. It took place at the Kungliga tennishallen in Stockholm, Sweden between 17 and 23 October 2011. First-seeded Gaël Monfils won the singles title.
See main article: 2011 If Stockholm Open – Singles. 
Gaël Monfils defeated 
Jarkko Nieminen, 7–5, 3–6, 6–2
See main article: 2011 If Stockholm Open – Doubles. 
Rohan Bopanna / 
Aisam-ul-Haq Qureshi defeated 
Marcelo Melo / Bruno Soares, 6–1, 6–3
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| France | Gaël Monfils | 10 | 1 | |
 Argentina | Juan Martín del Potro | 14 | 2 | |
| Stanislas Wawrinka | 19 | 3 | ||
| Argentina | Juan Ignacio Chela | 29 | 4 | |
| Kevin Anderson | 30 | 5 | ||
 Canada | Milos Raonic | 31 | 6 | |
| Ivan Dodig | 32 | 7 | ||
 Spain | Tommy Robredo | 46 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2011 If Stockholm Open – Singles qualifying.
