| Date: | 1–7 April |
| Edition: | 10th |
| Draw: | 32S / 16D |
| Surface: | Hard |
| Prize Money: | €30,000+H |
| Location: | Saint-Brieuc, France |
| Champs: | Jesse Huta Galung |
| Champd: |  Tomasz Bednarek /  Andreas Siljeström |
| Main Name: | Saint-Brieuc Challenger |
| Before Name: | Open Prévadiès Saint–Brieuc |
| After Name: | Open Harmonie mutuelle |
| Before Year: | 2012 |
| After Year: | 2014 |
The 2013 Open Harmonie mutuelle was a professional tennis tournament played on hard courts. It was the tenth edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Saint-Brieuc, France between 1 and 7 April 2013.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 France | Kenny de Schepper | 107 | 1 | |
 Austria | Andreas Haider-Maurer | 115 | 2 | |
| France | Marc Gicquel | 117 | 3 | |
| France | Josselin Ouanna | 143 | 4 | |
| Dustin Brown | 153 | 5 | ||
| France | Nicolas Mahut | 158 | 6 | |
 Serbia | Boris Pašanski | 164 | 7 | |
| Poland | Michał Przysiężny | 165 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Dustin Brown |  Australia | Rameez Junaid | 168 | 1 | ||
 United Kingdom | Jamie Delgado |  Slovakia | Igor Zelenay | 170 | 2 | |
| Poland | Tomasz Bednarek | Sweden | Andreas Siljeström | 197 | 3 | |
| Austria | Martin Fischer | Poland | Mateusz Kowalczyk | 266 | 4 |
The following pairs received wildcards into the doubles main draw:
Arnaud Grard / Glenn Le FlochmoenSee main article: 2013 Open Harmonie mutuelle – Singles.
Kenny de Schepper, 7–6 (7–4), 4–6, 7–6 (7–3)See main article: 2013 Open Harmonie mutuelle – Doubles.
Tomasz Bednarek / Andreas Siljeström def. Jesse Huta Galung / 
Konstantin Kravchuk, 6–3, 4–6, [10–7]