| Competition: | Liga Nacional |
| Season: | 1990–91 |
| Winners: | Oiartzun (1st title) |
| Relegated: | Puente Castro Tradehi Oviedo |
| Matches: | 56 |
| Total Goals: | 266 |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
The 1990–91 Liga Nacional de Fútbol Femenino was the third season of the Spanish women's football top tier. Oiartzun achieved their first title ever.
| Team | Location | |
|---|---|---|
| San Sebastián | ||
| Madrid | ||
| Barcelona | ||
| Oiartzun | ||
| Madrid | ||
| Barcelona | ||
| León | ||
| Oviedo |