1965–66 Segunda División
The 1965–66 Segunda División season was the 35th since its establishment and was played between 5 September 1965 and 3 April 1966.
Overview before the season
32 teams joined the league, including 4 relegated from the 1964–65 La Liga and 4 promoted from the 1964–65 Tercera División.;Relegated from La Liga:
- Murcia
- Levante
- Oviedo
- Deportivo La Coruña
- Condal
- Lérida
- Rayo Vallecano
- Badajoz
Group North
Teams
| Club | City | Stadium |
| CF Badalona | Badalona | Avenida de Navarra |
| Baracaldo Altos Hornos | Baracaldo | Lasesarre |
| Burgos CF | Burgos | El Plantío |
| RC Celta Vigo | Vigo | Balaídos |
| CD Condal | Barcelona | CF Barcelona |
| Deportivo La Coruña | La Coruña | Riazor |
| CD Europa | Barcelona | Cerdeña |
| Real Gijón | Gijón | El Molinón |
| CD Hospitalet | Hospitalet de Llobregat | Municipal de Deportes |
| SD Indauchu | Bilbao | Garellano |
| UP Langreo | Langreo | Ganzábal |
| UD Lérida | Lérida | Campo de Deportes |
| CA Osasuna | Pamplona | San Juan |
| Real Oviedo | Oviedo | Carlos Tartiere |
| Real Sociedad | San Sebastián | Atocha |
| Real Santander | Santander | El Sardinero |
League table
Top goalscorers
Top goalkeepers
Results
Group South
Teams
| Club | City | Stadium |
| Algeciras CF | Algeciras | El Mirador |
| CD Badajoz | Badajoz | El Vivero |
| Cádiz CF | Cádiz | Ramón de Carranza |
| CF Calvo Sotelo | Puertollano | Calvo Sotelo |
| Atlético Ceuta | Ceuta | Alfonso Murube |
| CD Constancia | Inca | Campo Nuevo |
| Granada CF | Granada | Los Cármenes |
| Hércules CF | Alicante | La Viña |
| Levante UD | Valencia | Vallejo |
| Melilla CF | Melilla | Álvarez Claro |
| CD Mestalla | Valencia | Mestalla |
| Real Murcia | Murcia | La Condomina |
| Rayo Vallecano | Madrid | Vallecas |
| Recreativo de Huelva | Huelva | Municipal |
| CD Tenerife | Santa Cruz de Tenerife | Heliodoro Rodríguez López |
| Real Valladolid | Valladolid | José Zorrilla |