1978–79 Segunda División B

The 1978–79 Segunda División B was the 2nd season of Segunda División B, the third highest level of the Spanish football league system, since its establishment in 1977. First and 2nd in each group were promoted to Segunda División, and the bottom three were relegated to the Tercera División.

Group 1
A total of 20 teams will contest the group, including 2 relegated from the Segunda División and 3 promoted from the Tercera División.

Promotion and relegation
Teams relegated from 1977–78 Segunda División Teams promoted from 1977–78 Tercera División
 * Real Oviedo
 * CD Tenerife
 * Zamora CF
 * CD Logroñés
 * CD Lugo

Teams
Teams from Aragon, Asturias, Basque Provinces, Canary Islands, Galicia, León, New Castile and Old Castile.

Group 2
A total of 20 teams will contest the group, including 3 relegated from the Segunda División and 17 promoted from the Tercera División.

Promotion and relegation
Teams relegated from 1977–78 Segunda División Teams promoted from 1977–78 Tercera División
 * CF Calvo Sotelo
 * Córdoba CF
 * Gimnástico de Tarragona
 * SD Ibiza
 * CP Cacereño

Teams
Teams from Andalusia, Balearic Islands, Catalonia, Extremadura, New Castile and Valencia.