1989–90 ACB season

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.

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
 * Game 1 May 4, 1990 @ Zaragoza: CAI Zaragoza 129 - Cajacanarias 82
 * Game 2 May 6, 1990 @ Zaragoza: CAI Zaragoza 98 - Cajacanarias 82
 * Game 3 May 11, 1990 @ La Laguna: Cajacanarias 83 - CAI Zaragoza 111

(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
 * Game 1 May 4, 1990 @ Málaga: Mayoral Maristas 78 - Caja San Fernando 75
 * Game 2 May 6, 1990 @ Málaga: Mayoral Maristas 67 - Caja San Fernando 76
 * Game 3 May 10, 1990 @ Sevilla: Caja San Fernando 85 - Mayoral Maristas 78
 * Game 4 May 12, 1990 @ Sevilla: Caja San Fernando 90 - Mayoral Maristas 86

(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
 * Game 1 May 3, 1990 @ Valencia: Pamesa Valencia 91 - Cajabilbao 90
 * Game 2 May 5, 1990 @ Valencia: Pamesa Valencia 85 - Cajabilbao 83
 * Game 3 May 10, 1990 @ Bilbao: Cajabilbao 86 - Pamesa Valencia 88

(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
 * Game 1 May 3, 1990 @ Huesca: Huesca Magia 83 - BBV Villalba 86
 * Game 2 May 5, 1990 @ Huesca: Huesca Magia 83 - BBV Villalba 87
 * Game 3 May 10, 1990 @ Collado Villalba: BBV Villalba 89 - Huesca Magia 92
 * Game 4 May 12, 1990 @ Collado Villalba: BBV Villalba 78 - Huesca Magia 71