1984–85 Primera División B de Baloncesto

The 1984–85 Primera División B was the second category of the Spanish basketball league system during the 1984–85 season

Format
14 teams played this season.


 * League of 14 teams, the first three are promoted to the Liga ACB, the last four are relegated to the Second Division.

Promotion and relegation (pre-season)
A total of 14 teams contested the league, including 6 sides from the 1983–84 season, three relegated from the 1983–84 ACB, four promoted from the Segunda División and one Wild Cards.


 * Teams relegated from Liga ACB
 * Peñas Huesca
 * Hospitalet ATO
 * EB Manresa


 * Teams promoted from Segunda División
 * CB Tizona
 * Claret Mútua Guanarteme
 * Caja Guadalajara
 * Caja Bilbao


 * Wild Cards
 * Maristas de Málaga


 * Teams that resigned to participate
 * UER Pineda