The 2020–21 Stade Rennais F.C. season is the club's 119th season in existence and the 27th consecutive season in the top flight of French football. In addition to the domestic league, Rennes will participate in this season's edition of the Coupe de France and will enter the UEFA Champions League for the first time in the group stage as a result of finishing in 3rd place during the previous Ligue 1 season. The season covers the period from 1 July 2020 to 30 June 2021.
^ abSince the winners of the 2020–21 Coupe de France, Paris Saint-Germain, qualified for European competition based on league position, the Europa League group stage spot reserved for the cup winners was passed to the fifth-placed team, and the Europa Conference League play-off round spot was passed to the sixth-placed team.