| 2015 Open Harmonie mutuelle | |
|---|---|
| Date | 6 April – 12 April |
| Edition | 12th |
| Draw | 32S / 16D |
| Prize money | €35,000+H |
| Surface | Hard |
| Location | Saint-Brieuc, France |
| Champions | |
| Singles | |
 Nicolas Mahut | |
| Doubles | |
| Grégoire Burquier / Alexandre Sidorenko | |
The 2015 Open Harmonie mutuelle was a professional tennis tournament played on hard courts. It was the twelfth edition of the tournament which was part of the 2015 ATP Challenger Tour. It took place in Saint-Brieuc, France between 6 April and 12 April 2015.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| FRA | Lucas Pouille | 114 | 1 |
 GER | Andreas Beck | 116 | 2 |
| FRA | Nicolas Mahut | 124 | 3 |
 NED | Igor Sijsling | 132 | 4 |
 JPN | Yūichi Sugita | 147 | 5 |
 CZE | Jan Hernych | 178 | 6 |
| FRA | David Guez | 191 | 7 |
 GBR | Edward Corrie | 218 | 8 |
The following players received wildcards into the singles main draw:
Grégoire Barrère Grégoire Burquier Quentin Halys Laurent RochetteThe following players received entry from the qualifying draw:
| Country | Player | Country | Player | Rank | Seed |
|---|---|---|---|---|---|
| NED | Wesley Koolhof | NED | Matwé Middelkoop | 324 | 1 |
 PHI | Ruben Gonzales | GBR | Darren Walsh | 345 | 2 |
| GER | Andreas Beck | GBR | Ken Skupski | 369 | 3 |
 POL | Andriej Kapaś | JPN | Yasutaka Uchiyama | 390 | 4 |
The following pairs received wildcards into the doubles main draw:
Nicolas Mahut def. Yūichi Sugita, 3–6, 7–6(7–3), 6–4 Grégoire Burquier / Alexandre Sidorenko def. Andriej Kapaś / Yasutaka Uchiyama, 6–3, 6–4