2020–21 Segunda División B

The 2020–21 Segunda División B season was the 44th since its establishment and the last as the third tier. A total of 102 teams participated, and were distributed in three groups of 20 teams each and two groups of 21, with eight subgroups of ten teams each and two with eleven teams each.

On 6 May 2020, the Royal Spanish Football Federation announced the expansion of the league to what were initially five groups of 20 teams each for the 2020–21 season due to promotion from the Tercera División groups in the curtailed past season being applied.

The season began on 18 October, following approval by each of Spain's autonomous regions' health departments. For next season the Segunda División B was demoted to the fourth level and dropped the B in its name in favour of the federation's Spanish initials RFEF on the creation of a new, two-group, 40-team third division called Primera División RFEF.

Overview before the season
102 teams joined the league, including four relegated from the 2019–20 Segunda División and 22 promoted from the 2019–20 Tercera División. No teams were relegated from the 2019–20 Segunda División B. The final groups were published on 31 August 2020.


 * Relegated from Segunda División:
 * Deportivo La Coruña
 * Extremadura
 * Numancia
 * Racing Santander


 * Promoted from Tercera División:'''


 * Alcoyano
 * Atzeneta
 * Betis Deportivo
 * Compostela
 * Covadonga
 * El Ejido
 * L'Hospitalet
 * Laredo
 * Lealtad
 * Linares
 * Lorca Deportiva
 * Marino
 * Mutilvera
 * Navalcarnero
 * Poblense
 * Portugalete
 * SD Logroñés
 * Socuéllamos
 * Tamaraceite
 * Tarazona
 * Villanovense
 * Zamora

Second phase
Each team from group A in the first phase played each group B team home and away.