The 2023–24 Tercera Federación season is the third for Tercera Federación, the national fifth level in the Spanish football league system.
It consists of 18 groups with 18 teams each.
[1] A total of 324 teams make up the league: 27 relegated from the 2022–23 Segunda Federación, 236 retained from the 2022–23 Tercera Federación, and 61 promoted from the regional divisions.
[2]
In addition to the 18 best-placed non-reserve teams qualifying for the 2024–25 Copa del Rey, the seven best non-reserve runners-up of the 18 groups that have not already qualified will also participate.