The 2021 Rally Finland was a motor racing event for rally cars that was held over three days between 1 and 3 October 2021. It marked the seventieth running of the Rally Finland. The event was the tenth round of the 2021 World Rally Championship, World Rally Championship-2 and World Rally Championship-3. The 2021 event was based in Jyväskylä in Central Finland and was contested over nineteen special stages totalling 287.11 km (178.40 mi) in competitive distance.

The 2021 FIA World Rally Championship was the forty-ninth season of the World Rally Championship, a rallying competition organised by the Fédération Internationale de l'Automobile (FIA). Teams and crews competed in twelve rallies for the World Rally Championships for Drivers, Co-drivers and Manufacturers. Crews were free to compete in cars complying with World Rally Car, Rally Pyramid and Group R regulations; however, only manufacturers competing with World Rally Cars homologated under regulations introduced in 2017 were eligible to score points in the Manufacturers' championship. The championship began in January 2021 with the Rallye Monte-Carlo and concluded in November 2021 with Rally Monza. The series was supported by the World Rally Championship-2 and World Rally Championship-3 categories at every round of the championship and by the Junior World Rally Championship at selected events.