| Competition: | Segunda División |
| Season: | 1979–80 |
| Dates: | 1 September 1979 – 1 June 1980 |
| Winners: | Murcia (5th title) |
| Matches: | 380 |
| Total Goals: | 900 |
| League Topscorer: | Patxi Iriguíbel (19 goals) |
| Prevseason: | 1978–79 |
| Nextseason: | 1980–81 |
The 1979–80 Segunda División season saw 20 teams participate in the second flight Spanish league. Real Murcia, Real Valladolid and CA Osasuna were promoted to Primera División. Celta de Vigo, Deportivo de La Coruña, Gimnàstic de Tarragona and Algeciras CF were relegated to Segunda División B.
| Goalscorers | Goals | Team |
|---|---|---|
 Patxi Iriguíbel | Osasuna | |
 Mario Cabrera | Castellón | |
| José Echeverria | Osasuna | |