Dereköy is a neighborhood in Efeler District, in Aydın Province, Türkiye. Dereköy lies at 62 m above sea level, in the Topçambaba mountains. It has 249 inhabitants. The nearest city is Aydın, 17.9 km to the west. Among the landmarks around are Nysa on the Maeander (14.3 km), Alabanda (23 km) and Seikilos epitaph (19.2 km).