The 1989–90 ACB season was the 7th season of the Liga ACB, after changing its name. The competition format was the same as the previous season. FC Barcelona won their 4th ACB title, and their 7th overall. It was their 4th ACB title in a row.

Team Standings

First stage

Group A-1

Group A-2

Second stage

Group I

Group II

Group III

Playoffs

Relegation Playoffs

Tenerife Nº 1 and Gran Canaria were relegated.

Qualification Games

(I-1) CAI Zaragoza vs. (III-3) Cajacanarias CAI Zaragoza win the series 3-0 and qualified to play in the A-1 the next season (I-2) Mayoral Maristas vs. (II-3) Caja San Fernando Caja San Fernando win the series 3-1 and qualified to play in the A-1 the next season (III-1) Pamesa Valencia vs. (II-2) Cajabilbao Pamesa Valencia win the series 3-0 and qualified to play in the A-1 the next season (II-1) Huesca Magia vs. (III-2) BBV Villalba BBV Villalba win the series 3-1 and qualified to play in the A-1 the next season

Championship Playoffs