1988–89 Segunda División B
The 1988–89 Segunda División B season was the 12th since its establishment. The first matches of the season were played on 3 September 1988, and the season ended in 25 June 1989.
Overview before the season
80 teams joined the league, including four relegated from the 1987–88 Segunda División and 17 promoted from the 1987–88 Tercera División. The composition of the groups was determined by the Royal Spanish Football Federation, attending to geographical criteria.;Relegated from Segunda División:
;Promoted from Tercera División:
- Racing Ferrol
- Oviedo Aficionados
- Santoña
- Barakaldo
- Palamós
- Nules
- Pegaso
- Gimnástica Medinense
- Jaén
- Algeciras
- Santa Ponsa
- Marino
- Torrevieja
- Don Benito
- Calahorra
- Binéfar
- Tomelloso
Group 1
Teams from Asturias, Basque Country, Cantabria, Castile and Leon and Galicia.Teams
| Team | Founded | Home city | Stadium |
| Arenteiro | 1958 | O Carballiño, Galicia | Espiñedo |
| Arosa | 1945 | Vilagarcía de Arousa, Galicia | A Lomba |
| As Pontes | 1960 | As Pontes, Galicia | O Poboado |
| Real Avilés | 1903 | Avilés, Asturias | Román Suárez Puerta |
| Barakaldo | 1917 | Barakaldo, Basque Country | Lasesarre |
| Basconia | 1913 | Basauri, Basque Country | Basozelai |
| Bergantiños | 1923 | Carballo, Galicia | As Eiroas |
| Bilbao Athletic | 1964 | Bilbao, Basque Country | San Mamés |
| Cultural Leonesa | 1923 | León, Castile and Leon | Antonio Amilvia |
| Durango | 1919 | Durango, Basque Country | Tabira |
| Lalín | 1974 | Lalín, Galicia | Manuel Anxo Cortizo |
| Langreo | 1961 | Langreo, Asturias | Ganzábal |
| Lemona | 1923 | Lemoa, Basque Country | Arlonagusia |
| Lugo | 1953 | Lugo, Galicia | Anxo Carro |
| Orense | 1952 | Ourense, Galicia | O Couto |
| Oviedo Aficionados | 1940 | Oviedo, Asturias | Carlos Tartiere |
| Ponferradina | 1922 | Ponferrada, Castile and Leon | Fuentesnuevas |
| Pontevedra | 1941 | Pontevedra, Galicia | [Estadio Estadio Municipal Juan Rojas|Municipal de Pasarón|Pasarón] |
| Racing de Ferrol | 1919 | Ferrol, Galicia | Manuel Rivera |
| Santoña | 1917 | Santoña, Cantabria | El Palomar |