2021 Open de Rennes – Doubles
| Doubles | |
|---|---|
| 2021 Open de Rennes | |
| Champions | Bart Stevens Tim van Rijthoven |
| Runners-up | Marek Gengel Tomáš Macháč |
| Score | 6–7(2–7), 7–5, [10–3] |
Antonio Šančić and Tristan-Samuel Weissborn were the defending champions but chose not to defend their title.
Bart Stevens and Tim van Rijthoven won the title after defeating Marek Gengel and Tomáš Macháč 6–7(2–7), 7–5, [10–3] in the final.