The 2021–22 ACB season, also known as Liga Endesa for sponsorship reasons, was the 39th season of the top Spanish professional basketball league, since its establishment in 1983. It started on 18 September 2021 with the first round of the regular season and ended on 19 June 2022 with the finals. Barça was the defending champion which lost the final series 1–3 to Real Madrid which reclaimed a record 36th Spanish title and their 14th ACB title ending a 3-year drought after their last triumph in 2019.