Beşiktaş Jimnastik Kulübü, also known simply as Beşiktaş, 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. Its market value as of January 2024 is €128.2 million. 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.

Beşiktaş is a district and municipality of Istanbul Province, Turkey. Its area is 18 km2 and its population is 175,190 (2022). It is located on the European shore of the Bosphorus strait. It is bordered on the north by Sarıyer and Şişli, on the west by Kağıthane and Şişli, on the south by Beyoğlu, and on the east by the Bosphorus. Directly across the Bosphorus is the district of Üsküdar.