2021–22 Tercera División RFEF

The 2021–22 Tercera División RFEF season was the first for the national fifth level in the Spanish football league system.

[1] The league has 18 groups like the former fourth tier Tercera División.

A total of 320 teams made up the league: 26 relegated from the 2020–21 Segunda División B, 234 retained from the 2020–21 Tercera División,[1] and 60 promoted from the regional divisions.

25 teams qualified for the 2022–23 Copa del Rey: the best teams in each group (excluding reserves) and the 7 best second-placed teams ranked by their points coefficient.

Should any second-placed team among these 7 qualify already as the best non-reserve team in its group, a ranking of third-placed teams would fill the remaining vacants.