Büyükdere is a neighbourhood of Sarıyer district in Istanbul, Turkey. It is situated on the European shore of the Bosphorus strait about 2 km (1.2 mi) southwest of Sarıyer. Its name means 'big stream' in Turkish, in reference to the river that used to flow into the Bosphorus here. A 14-kilometre-long (8.7 mi) major road, Büyükdere Avenue, starts south of Büyükdere, and runs inland as far as Şişli.