Has there ever been a 9–1 in the La Liga?

Yes, 5 times.

The first time: November 27, 1932, Athletic Bilbao beat Real Betis (Athletic Bilbao 9–1 Real Betis).

The last time: April 5, 2015, Real Madrid beat Granada CF (Real Madrid 9–1 Granada CF), 11 years ago.

Home wins: 5. Away wins: 0.

Nearby scores

1. 10–0 3 times
2. 10–1 5 times
3. 10–2 1 time
4. 9–0 12 times
5. 9–1 5 times
6. 9–2 2 times
7. 8–0 25 times
8. 8–1 21 times
9. 8–2 13 times

All games

1. April 5, 2015 Real Madrid 9–1 Granada CF
2. September 16, 1967 Real Madrid 9–1 Real Sociedad
3. October 8, 1950 Atlético de Madrid 9–1 Racing Santander
4. November 16, 1941 Real Madrid 9–1 CD Castellón
5. November 27, 1932 Athletic Bilbao 9–1 Real Betis