The 2018–19 Basketball Champions League was the third season of the Basketball Champions League (BCL), a European-wide professional basketball competition for clubs, that was launched by FIBA. The competition began in September 2018, with the qualifying rounds, and concluded in May 2019. It featured 19 domestic champions including two from France and Italy.

The Basketball Champions League (BCL), also commonly known as the FIBA Champions League, is an annual professional basketball competition for European clubs, organised by FIBA. It is the top-level competition organised by FIBA Europe, therefore the champion participates in the FIBA Intercontinental Cup.