The 1987–88 Primera División B was the second category of the Spanish basketball league system during the 1987–88 season.
28 teams played this season.
A total of 28 teams contested the league, including 22 sides from the 1986–87 season, two relegated from the 1986–87 ACB, one promoted from the Segunda División and three Wild Cards.
Matches played to determine the final ranking.
Third round winners are promoted to Liga ACB.