The 2009 Ethias Trophy was a professional tennis tournament played on indoor hard courts. It was the fifth edition of the tournament which was part of the Tretorn SERIE+ of the 2009 ATP Challenger Tour. It took place in Mons, Belgium between 5 and 11 October 2009.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Serbia | Janko Tipsarević | 55 | 1 | |
 Italy | Simone Bolelli | 63 | 2 | |
 Russian Federation | Evgeny Korolev | 66 | 3 | |
 France | Marc Gicquel | 68 | 4 | |
| Russian Federation | Teymuraz Gabashvili | 80 | 5 | |
 Belgium | Olivier Rochus | 81 | 6 | |
| France | Florent Serra | 82 | 7 | |
| Belgium | Christophe Rochus | 84 | 8 |
The following players received wildcards into the singles main draw:
Ruben Bemelmans Arthur de Greef David Goffin Yannick VandenbulckeThe following players received entry from the qualifying draw:
See main article: 2009 Ethias Trophy – Singles. Janko Tipsarević def. 
Sergiy Stakhovsky, 7–6(4), 6–3
See main article: 2009 Ethias Trophy – Doubles. 
Denis Istomin / Evgeny Korolev def. 
Alejandro Falla / Teymuraz Gabashvili, 6–7(4), 7–6(4), [11–9]
