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.
| Competition: | Segunda División B (group 1) |
| Season: | 1978–79 |
| Winners: | Palencia CF |
| Promoted: | Palencia CF Real Oviedo |
| Relegated: | Real Unión (resign) CD Lugo CD Pegaso Caudal Deportivo |
| Matches: | 380 |
| Total Goals: | 904 |
| Biggest Home Win: | Logroñés 6–0 Pegaso (18 March 1979) |
| Biggest Away Win: | Lugo 0–4 Logroñés (25 February 1979) |
| Highest Scoring: | Madrileño 6–1 Palencia (24 September 1978) Palencia 6–1 Huesca (29 April 1979) Torrejón 5–2 Pontevedra (6 May 1979) |
| Prevseason: | 1977–78 |
| Nextseason: | 1979–80 |
A total of 20 teams will contest the group, including 2 relegated from the Segunda División and 3 promoted from the Tercera División.
Teams relegated from 1977–78 Segunda División
Teams promoted from 1977–78 Tercera División
Teams from Aragon, Asturias, Basque Provinces, Canary Islands, Galicia, León, New Castile and Old Castile.
| Team | Founded | Home city | Stadium | |
|---|---|---|---|---|
| Atlético Madrileño | 1969 | Madrid, New Castile | Vicente Calderón | |
| Bilbao Athletic | 1964 | Bilbao, Basque Provinces | Lezama | |
| Caudal | 1918 | Mieres, Asturias | Hermanos Antuña | |
| Cultural Leonesa | 1923 | León, León | Antonio Amilivia | |
| Ensidesa | 1956 | Avilés, Asturias | Muro de Zaro | |
| Huesca | 1960 | Huesca, Aragon | El Alcoraz | |
| Langreo | 1961 | Langreo, Asturias | Ganzábal | |
| Logroñés | 1940 | Logroño, Old Castile | Las Gaunas | |
| Lugo | 1953 | Lugo, Galicia | Ángel Carro | |
| Mirandés | 1927 | Miranda de Ebro, Old Castile | Anduva | |
| Orense | 1952 | Ourense, Galicia | O Couto | |
| Oviedo | 1926 | Oviedo, Asturias | Carlos Tartiere | |
| Palencia | 1968 | Palencia, Old Castile | La Balastera | |
| Pegaso | 1962 | Tres Cantos, New Castile | La Foresta | |
| Pontevedra | 1941 | Pontevedra, Galicia | Pasarón | |
| Real Unión | 1915 | Irun, Basque Provinces | Stadium Gal | |
| Sestao | 1916 | Sestao, Basque Provinces | Las Llanas | |
| Tenerife | 1912 | Tenerife, Canary Islands | Heliodoro Rodríguez López | |
| Torrejón | 1953 | Torrejón de Ardoz, New Castile | Las Veredillas | |
| Zamora | 1968 | Zamora, León | Ramiro Ledesma |
| Goalscorers | Goals | Team |
|---|---|---|
 Luis María Muñoz | 21 | CD Logroñés |
| Esteban Martínez | 18 | AD Torrejón |
| Cesáreo Parajón | 14 | Real Oviedo |
| José Luis Urrecho | 14 | CD Mirandés |
| Pedro Morales | 14 | AD Torrejón |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| José Francisco Díez | 24 | 34 | Palencia CF | ||
| José Muñoz | 21 | 25 | CD Mirandés | ||
| Esteban Folgueral | 29 | 34 | Cultural Leonesa | ||
| Francisco Buyo | 19 | 22 | SD Huesca | ||
| Camuel | 34 | 36 | Real Oviedo |
| Competition: | Segunda División B (group 2) |
| Season: | 1978–79 |
| Winners: | Levante UD |
| Promoted: | Levante UD Gimnástico de Tarragona |
| Relegated: | CP Cacereño Vinaroz CF CD Olímpico |
| Matches: | 380 |
| Total Goals: | 977 |
| Biggest Home Win: | Levante 8-0 Olímpico (6 May 1979) |
| Biggest Away Win: | Onteniente 1-5 Barcelona (10 June 1979) Córdoba 0-4 Diter Zafra (6 May 1979) |
| Highest Scoring: | Onteniente 7-2 Olímpico (3 December 1978) |
| Prevseason: | 1977–78 |
| Nextseason: | 1979–80 |
A total of 20 teams will contest the group, including 3 relegated from the Segunda División and 17 promoted from the Tercera División.
Teams relegated from 1977–78 Segunda División
Teams promoted from 1977–78 Tercera División
Teams from Andalusia, Balearic Islands, Catalonia, Extremadura, New Castile and Valencia.
| Team | Founded | Home city | Stadium | |
|---|---|---|---|---|
| Badajoz | 1905 | Badajoz, Extremadura | Vivero | |
| Barcelona Atlético | 1970 | Barcelona, Catalonia | Fabra i Coats | |
| Cacereño | 1919 | Cáceres, Extremadura | Príncipe Felipe | |
| Calvo Sotelo | 1948 | Puertollano, Castilla–La Mancha | Calvo Sotelo | |
| Ceuta | 1970 | Ceuta | Alfonso Murube | |
| Córdoba | 1954 | Córdoba, Andalusia | El Árcangel | |
| Díter Zafra | 1930 | Zafra, Extremadura | Nuevo Estadio de Zafra | |
| Eldense | 1921 | Elda, Valencia | Pepico Amat | |
| Gerona | 1930 | Girona, Catalonia | Montilivi | |
| Gimnástico de Tarragona | 1886 | Tarragona, Catalonia | José Luis Calderón | |
| Ibiza | 1956 | Ibiza, Balearic Islands | Carrer Canàries | |
| Levante | 1909 | Valencia, Valencia | Nuevo Estadio Levante | |
| Linares | 1961 | Linares, Andalusia | Linarejos | |
| Lleida | 1939 | Lleida, Catalonia | Camp d'Esports | |
| Onteniente | 1947 | Ontinyent, Valencia | El Clariano | |
| Portuense | 1928 | El Puerto de Santa María, Andalusia | José del Cuvillo | |
| San Andrés | 1909 | Barcelona, Catalonia | Calle Santa Coloma | |
| Sevilla Atlético | 1950 | Seville, Andalusia | Ciudad Deportiva José Ramón Cisneros Palacios | |
| Vinaroz | 1965 | Vinaròs, Valencia | Campo Maestrat | |
| Xerez | 1947 | Jerez de la Frontera, Andalusia | Domecq |
| Goalscorers | Goals | Team |
|---|---|---|
| Andoni Murúa | 23 | Levante UD |
| Fernando Aramburu | 22 | AgD Ceuta |
| Ramón Clotet | 19 | UE Lleida |
| Ángel Robles | 16 | Onteniente CF |
| 16 | UE Lleida | |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Vicente Amigó | 18 | 35 | Gimnástico de Tarragona | ||
| Jorge Barrie | 20 | 38 | Levante UD | ||
| José Cervantes | 27 | 33 | AgD Ceuta | ||
| Hilario Sánchez | 29 | 30 | CD Díter Zafra | ||
| Jesús Luis Sánchez | 38 | 38 | .00 | CF Calvo Sotelo |