It started on 24 September 2019 with the first round of the regular season and ended on 30 June 2020 in an exceptional end-of-season tournament in Valencia due to the COVID-19 pandemic.

Real Madrid was the defending champion which was eliminated by San Pablo Burgos which qualified to semifinals for its first time.

A total of 18 teams contested the league, including 16 sides from the 2018–19 season and two promoted from the 2018–19 LEB Oro.

On March 10, 2020, the Ministry of Health of Spain decreed that all games would be played behind closed doors due to the COVID-19 pandemic.

[37] On April 20, 2020, the ACB clubs agreed unanimously to finish prematurely the regular season due to force majeure and to continue the league with a 12-team format with two groups and a Final Four to decide the winner, with all games played in a single stage.