2017–18 Segunda División B

The 2017–18 Segunda División B season will be the 40th since its establishment. The first matches of the season will be played in August 2016, and the season will end in June 2017 with the promotion play-off finals.

Overview before the season
80 teams will join the league, including four relegated from the 2016–17 Segunda División and 18 promoted from the 2016–17 Tercera División. The composition of the groups must be determined by the Royal Spanish Football Federation, attending to geographical criteria.


 * Relegated from Segunda División:
 * Mirandés


 * Promoted from Tercera División:'''


 * Atlético Madrid B
 * Deportivo Aragón
 * Deportivo B
 * Formentera
 * Gimnástica Segoviana
 * Las Palmas Atlético
 * Mirandés
 * Olot
 * Real Betis B
 * Talavera de la Reina

Teams
The following teams have qualified for the 2017–18 Segunda División B season. The composition of the groups will be determined by the RFEF.


 * Alcoyano
 * Amorebieta
 * Arenas
 * Atlético Madrid B
 * Atlético Saguntino
 * Badalona
 * Barakaldo
 * Bilbao Athletic
 * Boiro
 * Burgos
 * Caudal
 * Celta Vigo B
 * Córdoba B
 * Cornellà
 * Coruxo
 * Deportivo Aragón


 * Deportivo La Coruña B
 * Ebro
 * El Ejido
 * Extremadura
 * Formentera
 * Fuenlabrada
 * Gavà
 * Gernika
 * Gimnástica Segoviana
 * Granada B
 * Guijuelo
 * Hércules
 * Izarra
 * Jumilla
 * Las Palmas Atlético
 * Lealtad


 * Leioa
 * Linense
 * Llagostera
 * Lleida Esportiu
 * UD Logroñés
 * Mallorca B
 * Marbella
 * Melilla
 * Mérida
 * Mirandés
 * Navalcarnero
 * Olot
 * Osasuna B
 * Ponferradina
 * Pontevedra


 * Racing Ferrol
 * Rayo Majadahonda
 * Real Betis B
 * Real Madrid Castilla
 * Real Sociedad B
 * Real Unión
 * Recreativo
 * Sabadell
 * San Fernando
 * San Sebastián de los Reyes
 * Talavera de la Reina
 * Toledo
 * Tudelano
 * Valladolid B
 * Villarreal B