Original Adidas football shirt Beşiktaş JK 2018/19

The 2018–19 Beşiktaş J.K. season was the club's 115th year since its foundation, 97th season of competitive football and the club's 60th season contesting the Süper Lig, the top division of Turkish football. The 2018–19 season lasted from 1 July 2018 to 30 June 2019.

On 19 April 2018, Beşiktaş' Turkish Cup match against Fenerbahçe was abandoned after manager Beşiktaş Şenol Güneş was struck on the head with an object. As a result, the Turkish Football Federation ordered the remaining 32 minutes to be played behind closed doors. However, Beşiktaş refused to travel to the match after an appeal failed. As a result, Beşiktaş was banned from competing in the 2018–19 Turkish Cup.