The 1988–89 Primera División season was the second category of the Spanish basketball league system during the 1988–89 season. It was the first played with the name of Primera División.

This article does not cite any sources. (April 2021)

16 teams played this season.

• Regular Season
  • League of 16 teams in a single group where they play all against all in two rounds.
  • The last two teams are relegated to Segunda Division.

• Promotion playoffs
  • The top 8 play two knockout rounds for promotion. The first round is the best of 3 matches (first and third matches are played at the home of the best classified in the previous phase) and the second to the best of 5 (first, third and fifth matches are played at the home of the best classified in the phase previous). The two winners go up to the ACB League.

• Relegation playoffs
  • Those classified between the 11th to 14th places play a best of 5 matches (first, third and fifth matches are played at the home of the best classified in the previous phase), the 2 losers go down to Segunda Division.