The Spanish basketball league system is a series of connected competitions for professional basketball clubs in Spain. The system has a hierarchical format with a promotion and relegation system between competitions at different levels.
There are currently four different nation-wide leagues in the system - the 1st tier Liga ACB, the 2nd tier LEB Oro, the 3rd tier LEB Plata and the 4th tier Liga EBA.
Liga ACB is organized by the Asociación de Clubs de Baloncesto (Basketball Clubs Association), which is a private organization. LEB leagues and Liga EBA are organized by the Spanish Basketball Federation while the lower tiers are organized by the regional federations.
For the 2018–19 season, the Spanish basketball league system is as follows:
For the 2015–16 season, the lower divisions for each of the Autonomous Communities is as follows:
Since the 2001–02 season, there are currently different competitions on the pyramid.