| Competition: | Segunda División |
| Season: | 1970–71 |
| Winners: | Real Betis |
| Promoted: | Real Betis Burgos Deportivo La Coruña Córdoba |
| Relegated: | Onteniente Calvo Sotelo Moscardó |
| League Topscorer: | Santillana (16 goals) |
| Best Goalkeeper: | Manuel Campos (0.75 goals/match) |
| Biggest Home Win: | (30 May 1971) |
| Biggest Away Win: | (6 September 1970) |
| Highest Scoring: | (22 November 1970) |
| Matches: | 380 |
| Total Goals: | 791 |
| Prevseason: | 1969–70 |
| Nextseason: | 1971–72 |
The 1970–71 Segunda División season was the 40th since its establishment and was played between 5 September 1970 and 6 June 1971.
20 teams joined the league, including 3 relegated from the 1969–70 La Liga and 7 promoted from the 1969–70 Tercera División.
| Goalscorers | Goals | Team |
|---|---|---|
 Santillana | 16 | Real Santander |
| 15 | Córdoba | |
| Marcos Orts | 15 | Hércules |
| Enrique Galán | 14 | Oviedo |
| Antonio Illán | 13 | Rayo Vallecano |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Manuel Campos | 24 | 32 | Real Betis | ||
| Alejandro Samper | 28 | 37 | Rayo Vallecano | ||
| Victoriano Bilbao | 29 | 38 | Burgos | ||
| Miguel Ángel Molina | 28 | 36 | Córdoba | ||
| Andrés Mendieta | 31 | 38 | Castellón |