Beşiktaş (pronounced [beˈʃictaʃ]) is a municipality (belediye) of Istanbul, Turkey, located on the European shore of the Bosphorus. 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 municipality of Üsküdar.

The Beşiktaş municipality includes a number of important sites along the European side of the Bosphorus, from Dolmabahçe Palace in the south to Bebek in the north. The municipality also includes many inland neighborhoods such as Levent and Etiler. Some of its other well-known neighborhoods are Yıldız, Kuruçeşme, Ortaköy, and Arnavutköy.