The 2021–22 Championnat National 3 was the fifth season of the fifth tier in the French football league system in its current format. The competition is normally contested by 168 clubs split geographically across 12 groups of 14 teams, but this season had 169 clubs due to the administrative relegation of Gazélec Ajaccio. The teams included amateur clubs (although a few were semi-professional) and the reserve teams of professional clubs.