1955–56 Tercera División

The 1955–56 Tercera División season was the 20th since its establishment.

Play-offs

 * Tiebreaker:

Promotion/relegation Segunda División

 * Tiebreaker:


 * Promotion to Segunda: Eldense
 * Remain on Segunda:: Sestao, Logroñés & Castellón
 * Relegation to Tercera: Plus Ultra

Second round

 * Tiebreaker:

Third round

 * Tiebreaker:


 * Promotion to Segunda: Avilés, Rayo Vallecano, Alicante & Pontanés