See main article: 2020 Open de Rennes.
Sander Arends and Tristan-Samuel Weissborn were the defending champions[1] but only Weissborn chose to defend his title, partnering Antonio Šančić. Weissborn successfully defended his title after defeating Teymuraz Gabashvili and Lukáš Lacko 7–5, 6–7(5–7), [10–7] in the final.