The 2021 FIA Junior World Rally Championship was the twentieth season of the Junior World Rally Championship, an auto racing championship recognised by the Fédération Internationale de l'Automobile, running in support of the World Rally Championship. The Junior World Rally Championship is open to drivers under the age of thirty—although no such restriction existed for co-drivers—competing in identical one-litre Ford Fiesta R2s built and maintained by M-Sport. The championship began in April 2021 at the Croatia Rally.