| Competition: | Segunda División B |
| Season: | 1983–84 |
| Winners: | CE Sabadell FC CF Lorca Deportiva |
| Promoted: | CE Sabadell FC CF Lorca Deportiva CD Logroñés CF Calvo Sotelo |
| Relegated: | Barakaldo CF SD Huesca Racing Ferrol RC Portuense Córdoba CF SD Ibiza |
| League Topscorer: | Pepe Mel (30 goals) |
| Best Goalkeeper: | Luciano Casado (0.65 goals/match) |
| Biggest Home Win: | (13 May 1984) |
| Biggest Away Win: | (4 December 1983) |
| Highest Scoring: | (13 May 1984) (23 October 1983) (18 March 1984) |
| Matches: | 760 |
| Total Goals: | 1893 |
| Prevseason: | 1982–83 |
| Nextseason: | 1984–85 |
The 1983–84 Segunda División B season was the 7th since its establishment. The first matches of the season were played on 3 September 1983, and the season ended on 27 May 1984.
40 teams joined the league, including four relegated from the 1982–83 Segunda División and 6 promoted from the 1982–83 Tercera División. The composition of the groups was determined by the Royal Spanish Football Federation, attending to geographical criteria.
Teams from Andorra, Aragon, Asturias, Basque Country, Catalonia, Galicia and Navarre.
| Team | Founded | Home city | Stadium | |
|---|---|---|---|---|
| Alavés | 1921 | Vitoria-Gasteiz, Basque Country | Mendizorrotza | |
| Endesa Andorra | 1957 | Andorra, Aragon | Juan Antonio Endeiza | |
| FC Andorra | 1942 | Andorra la Vella, Andorra | Comunal | |
| Arosa | 1945 | Vilagarcía de Arousa, Galicia | A Lomba | |
| Real Avilés Industrial | 1903 | Avilés, Asturias | Muro de Zaro | |
| Barakaldo | 1917 | Barakaldo, Basque Country | Lasesarre | |
| Binéfar | 1922 | Binéfar, Aragon | El Segalar | |
| Compostela | 1962 | Compostela, Galicia | Santa Isabel | |
| Erandio | 1915 | Erandio, Basque Country | Nuevo Ategorri | |
| Figueras | 1919 | Figueres, Catalonia | L'Alfar | |
| Gimnástico de Tarragona | 1886 | Tarragona, Catalonia | Nou Estadi | |
| Huesca | 1960 | Huesca, Aragon | El Alcoraz | |
| Lérida | 1939 | Lleida, Catalonia | Camp d'Esports | |
| Logroñés | 1940 | Logroño, La Rioja | Las Gaunas | |
| Osasuna Promesas | 1962 | Pamplona, Navarre | Tajonar | |
| Racing de Ferrol | 1919 | Ferrol, Galicia | Manuel Rivera | |
| Sabadell | 1903 | Sabadell, Catalonia | La Nova Creu Alta | |
| San Sebastián | 1951 | San Sebastián, Basque Country | Atotxa | |
| Sestao | 1916 | Sestao, Basque Country | Las Llanas | |
| Sporting Atlético | 1960 | Gijón, Asturias | Mareo |
| Goalscorers | Goals | Team |
|---|---|---|
 Miguel Ángel Lotina | 21 | Logroñés |
| Jon García | 18 | Sestao |
| Ramón Masqué | 17 | Gimnástico de Tarragona |
| Ángel Giménez | 17 | Binéfar |
| Marañón | 16 | Sabadell |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Luciano Casado | 19 | 29 | Logroñés | ||
| Tomás Cuenca | 28 | 36 | Alavés | ||
| Joan Capó | 31 | 38 | Sabadell | ||
| José Palomo | 33 | 36 | Gimnástico de Tarragona | ||
| Francisco Javier Echevarría | 33 | 34 | Sestao |
Teams from Andalusia, Aragon, Balearic Islands, Castile and León, Castilla–La Mancha, Catalonia, Ceuta, Extremadura, Madrid, Region of Murcia and Valencian Community.
| Goalscorers | Goals | Team |
|---|---|---|
| Pepe Mel | 30 | Alcalá |
| Argimiro Márquez | 18 | Linense |
| Juan Carlos Plaza | 16 | Real Jaén |
| 16 | Talavera | |
| Antonio Rivera | 15 | Parla |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Agapito Moncaleán | 28 | 38 | Algeciras | ||
| Fernando Sánchez | 31 | 38 | Calvo Sotelo | ||
| José María Olivares | 31 | 31 | .00 | Parla/Alcalá | |
| Vicente Merino | 38 | 38 | .00 | Zamora | |
| Juan Miguel Recio | 34 | 33 | Xerez |