The Spanish basketball league system is a series of connected competitions for professional basketball clubs in Spain.
[1] The system has a hierarchical format with a promotion and relegation system between competitions at different levels.
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: