The 2011 BMW Ljubljana Open was a professional tennis tournament played on clay courts. It was the 20th edition of the tournament which was part of the 2011 ATP Challenger Tour. It took place in Ljubljana, Slovenia between 19 and 25 September 2011.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Slovenia | Blaž Kavčič | 98 | 1 | |
 Argentina | Leonardo Mayer | 119 | 2 | |
| Slovenia | Grega Žemlja | 121 | 3 | |
 Italy | Paolo Lorenzi | 135 | 4 | |
 Spain | Pablo Carreño Busta | 141 | 5 | |
 Serbia | Nikola Ćirić | 160 | 6 | |
| Antonio Veić | 163 | 7 | ||
 Canada | Frank Dancevic | 164 | 8 |
The following players received wildcards into the singles main draw:
Tomislav Brkić Tom Kočevar-Dešman Tilen ŽitnikThe following players received entry from the qualifying draw:
Mirza Bašić Daniele Giorgini Diego SchwartzmanThe following players received entry from a lucky loser spot:
Enrico BurziSee main article: 2011 BMW Ljubljana Open – Singles. Paolo Lorenzi def. Grega Žemlja, 6–2, 6–4
See main article: 2011 BMW Ljubljana Open – Doubles. Aljaž Bedene / Grega Žemlja def. Roberto Bautista Agut / Iván Navarro, 6–3, 6–7(10–12), [12–10]