| 2021 Open Quimper Bretagne | |
|---|---|
| Date | 25–31 January |
| Edition | 11th |
| Surface | Hard (Indoor) |
| Location | Quimper, France |
| Champions | |
| Singles | |
 Sebastian Korda | |
| Doubles | |
 Grégoire Barrère / Albano Olivetti | |
The 2021 Open Quimper Bretagne was a professional tennis tournament played on hard courts. It was the eleventh edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Quimper, France between 25 and 31 January 2021.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| FRA | Lucas Pouille | 74 | 1 |
| USA | Sebastian Korda | 103 | 2 |
| FRA | Grégoire Barrère | 111 | 3 |
| USA | Denis Kudla | 116 | 4 |
 ITA | Federico Gaio | 136 | 5 |
 AUT | Jurij Rodionov | 144 | 6 |
 GER | Peter Gojowczyk | 147 | 7 |
 SUI | Marc-Andrea Hüsler | 148 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Antoine Cornut-Chauvinc Tristan Lamasine 
Illya Marchenko 
Kacper Żuk Sebastian Korda def. 
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