| 2019 Open Harmonie mutuelle | |
|---|---|
| Date | 25–31 March |
| Edition | 16th |
| Surface | Hard (indoor) |
| Location | Saint-Brieuc, France |
| Champions | |
| Singles | |
 Kamil Majchrzak | |
| Doubles | |
 Jonathan Erlich /  Fabrice Martin | |
The 2019 Open Harmonie mutuelle was a professional tennis tournament played on hard courts. It was the sixteenth edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Saint-Brieuc, France between 25 and 31 March 2019.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 LTU | Ričardas Berankis | 82 | 1 |
 GER | |||
| FRA | Grégoire Barrère | 120 | 3 |
 RUS | Evgeny Donskoy | 126 | 4 |
 ITA | Stefano Travaglia | 132 | 5 |
| FRA | Corentin Moutet | 136 | 6 |
| FRA | Antoine Hoang | 137 | 7 |
| POL | Kamil Majchrzak | 154 | 8 |
 AUT | Dennis Novak | 156 | 9 |
 EST | Jürgen Zopp | 159 | 10 |
| FRA | Quentin Halys | 163 | 11 |
 BIH | Mirza Bašić | 167 | 12 |
| GER | Daniel Brands | 168 | 13 |
| AUT | Sebastian Ofner | 184 | 14 |
 KAZ | Aleksandr Nedovyesov | 185 | 15 |
 SVK | Filip Horanský | 195 | 16 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as an alternate:
The following players received entry into the singles main draw using their ITF World Tennis Ranking:
Andrés Artuñedo Baptiste Crepatte Grégoire Jacq Roman Safiullin The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Kamil Majchrzak def. Maxime Janvier 6–3, 7–6(7–1). Jonathan Erlich / Fabrice Martin def. Jonathan Eysseric / 
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