Beşiktaş Jimnastik Kulübü (Turkish pronunciation: [beˈʃictaʃ], lit. 'Beşiktaş Gymnastics Club'), abbreviated as BJK, is a Turkish professional sports club founded in 1903 that is based in the Beşiktaş district of Istanbul. The club's football team is one of the Big Three in Turkey and one of the most successful teams in the country, having never been relegated to a lower division. It was the first registered sports club in the country and one of the few that acquired the right to bear the Turkish flag on its crest.
Its football team has won 21 league titles including 16 Turkish Süper Lig, three Turkish National Division and two Turkish Football Championship titles, along with 11 Turkish Cup titles. Beşiktaş is also the only team to have won the Süper Lig undefeated, in the 1991–92 campaign. The team last won the Turkish Süper Lig title during the 2020–21 season and the Turkish Cup in the 2023–24 season. The club's home ground is Beşiktaş Stadium, a 42,684-capacity all-seater stadium located by Dolmabahçe Palace. The stadium has been considered one of the best in the world for location, design, comfort, technology, atmosphere, and transportation.