| Competition: | Segunda División B |
| Season: | 1988–89 |
| Winners: | Atlético Madrileño Bilbao Athletic Levante Palamós |
| Promoted: | Atlético Madrileño Bilbao Athletic Levante Palamós |
| Relegated: | Algeciras Arenteiro Arnedo Barcelona Aficionados Bergantiños Betis Deportivo Don Benito Gimnástica Medinense Lorca Nules Oviedo Aficionados Plasencia Poblense Polideportivo Almería Santa Ponsa Santoña Serverense San Sebastián de los Reyes Terrassa |
| League Topscorer: | Juan Carlos de Diego (33 goals) |
| Best Goalkeeper: | Manolo López (0.46 goals/match) |
| Biggest Home Win: | (10 September 1988) (25 March 1989) (4 June 1989) |
| Biggest Away Win: | (18 December 1988) |
| Highest Scoring: | (12 February 1989) |
| Matches: | 1520 |
| Total Goals: | 3486 |
| Longest Wins: | 7 matches Barakaldo FC Andorra Leganés |
| Longest Unbeaten: | 31 matches Palamós |
| Longest Winless: | 19 matches Santa Ponsa |
| Longest Losses: | 9 matches Terrassa |
| Prevseason: | 1987–88 |
| Nextseason: | 1989–90 |
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.
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.
Teams from Asturias, Basque Country, Cantabria, Castile and Leon and Galicia.
| 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 | Pasarón | |
| Racing de Ferrol | 1919 | Ferrol, Galicia | Manuel Rivera | |
| Santoña | 1917 | Santoña, Cantabria | El Palomar |
| Goalscorers | Goals | Team |
|---|---|---|
 José Luis Astiazaran | 22 | Barakaldo |
| José Ángel Uribarrena | 20 | Bilbao Athletic |
| Moska | 17 | Bilbao Athletic |
| 14 | Cultural Leonesa | |
| Rui Wamba | 14 | Baskonia |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Pachu | 16 | 30 | Avilés | ||
| José Domínguez | 20 | 36 | Lugo | ||
| Fermín Hortas | 22 | 36 | Ourense | ||
| Manuel Espinosa | 22 | 30 | Pontevedra | ||
| Eugenio Lozano | 23 | 28 | Lemona |
Teams from Andorra, Aragon, Basque Country, Balearic Islands, Catalonia, La Rioja and Navarre.
| Goalscorers | Goals | Team |
|---|---|---|
| Salvador Cardona | 25 | Palamós |
| Manuel Escribano | 16 | Gimnàstic |
| Rafael Sanz | 15 | Sporting Mahonés |
| 15 | Atlético Baleares | |
| Gabriel Ramón | 15 | Atlético Baleares |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Francesc Boix | 24 | 34 | Palamós | ||
| José Antonio Arévalo | 28 | 38 | FC Andorra | ||
| Patxi Hernández | 26 | 30 | San Sebastián | ||
| Enrique Ciaurriz | 34 | 38 | Sporting Mahonés | ||
| José Pérez | 31 | 33 | Teruel |
Teams from Andalusia, Canary Islands, Castile and Leon, Castilla–La Mancha, Extremadura and Madrid.
| Goalscorers | Goals | Team |
|---|---|---|
| Juan Carlos de Diego | 33 | Atlético Madrileño |
| Juan Sabas | 21 | Pegaso |
| Julio Suárez | 20 | Marino |
| 16 | Badajoz | |
| Manuel Toledano | 14 | Linares |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Peio Aguirreoa | 22 | 37 | Linares | ||
| José Ángel del Cerro | 23 | 33 | Plasencia | ||
| Alex Pinilla | 27 | 34 | Sevilla Atlético | ||
| Diego Díaz | 29 | 30 | Atlético Madrileño | ||
| Pedro Clavijo | 31 | 32 | Badajoz |
Teams from Andalusia, Castilla–La Mancha, Ceuta, Melilla, Region of Murcia and Valencian Community.
| Goalscorers | Goals | Team |
|---|---|---|
| Antonio López | 17 | Levante |
| José Luis Mínguez | 17 | Atlético Sanluqueño |
| Adriano García | 16 | Villarreal |
| 16 | Albacete | |
| Julio Cabello | 16 | Algeciras |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Manolo López | 16 | 35 | Ceuta | ||
| Antonio Museros | 27 | 37 | Levante | ||
| Juan Tapia | 24 | 31 | Marbella | ||
| Pedro Torrano | 27 | 35 | Atlético Sanluqueño | ||
| Juan Miguel San Román | 29 | 36 | Gandía |