The 2021–22 Campeonato de Portugal was the ninth season of Portuguese football's recreated fourth-tier league, since the merging of the Segunda Divisão and Terceira Divisão in 2013, and the seventh season under the current Campeonato de Portugal title.
[1] After the transition season of 2020–21, due to COVID effects and creation of Liga 3, the number of participating teams was reduced from 96 to 63.
In each series, teams played against each other in a home-and-away double round-robin system.
In the third stage, each winner of promotion series faced each other on a neutral venue to decide the champion.
In each series, teams played against each other in a home-and-away double round-robin system.