| 1965–66 Liga Nacional de Baloncesto | |
|---|---|
| League | Liga Nacional |
| Sport | Basketball |
| Number of teams | 10 |
| TV partner(s) | Televisión Española |
| Regular Season | |
| Season champions | Real Madrid |
The 1965–66 season was the 10th season of the Liga Nacional de Baloncesto. Real Madrid won the title.
Tie-break game: CB Ripollet 47–56 CN Helios (game played in Madrid)