The 2018–19 Basketbol Süper Ligi was the 53rd season of the Basketbol Süper Ligi, the top-tier level professional club basketball league in Turkey.

Anadolu Efes captured its fourteenth title and its first championship in 10 years, after it defeated Fenerbahçe in seven in the finals.

Yeşilgiresun Belediye and Uşak Sportif were relegated after finishing in the last two places during the previous season.

Türk Telekom promoted as the champions of the Turkish Basketball First League (TBL).

[3] On 13 July 2018, it was announced that Bahçeşehir Koleji received the vacant BSL spot.