1988–89 ACB season

The first six of the white group and the champions of the red and blue groups played for the title.

FC Barcelona won their third ACB title, and their 6th overall.

It was their third ACB title in a row.

Caja Guipúzcoa and Valvi Girona were relegated.

(I-1) Clesa Ferrol vs. (II-3) Pamesa Valencia Clesa Ferrol win the series 3-0 and qualified to play in the A-1 the next season (I-2) Magia de Huesca vs. (III-3) BBV Villalba BBV Villalba win the series 3-2 and qualified to play in the A-1 the next season (III-1) Estudiantes Bose vs. (II-2) Mayoral Maristas Estudiantes Bose win the series 3-0 and qualified to play in the A-1 the next season (II-1) Cajabilbao vs. (III-2) Puleva Baloncesto Granada Cajabilbao win the series 3-2 and qualified to play in the A-1 the next season