The 2011 Ethias Trophy was a professional tennis tournament played on hard courts. It was the seventh edition of the tournament which was part of the 2011 ATP Challenger Tour and the Tretorn SERIE+. It took place in Mons, Belgium between 3 and 9 October 2011.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Belgium | Xavier Malisse | 46 | 1 | |
 Italy | Andreas Seppi | 49 | 2 | |
 Ukraine | Sergiy Stakhovsky | 63 | 3 | |
 France | Adrian Mannarino | 67 | 4 | |
| France | Julien Benneteau | 72 | 5 | |
| Belgium | Olivier Rochus | 75 | 6 | |
| France | Nicolas Mahut | 84 | 7 | |
| Belgium | Steve Darcis | 86 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
See main article: 2011 Ethias Trophy – Singles. Andreas Seppi def. Julien Benneteau, 2–6, 6–3, 7–6(7–4)
See main article: 2011 Ethias Trophy – Doubles. 
Johan Brunström / 
Ken Skupski def. Kenny de Schepper / Édouard Roger-Vasselin, 7–6(7–4), 6–3
