Sagalassos (), also known as Selgessos () and Sagallesos (), is an archaeological site in southwestern Turkey, about 100 km north of Antalya (ancient Attaleia), and 30 km from Burdur and Isparta. The ancient ruins of Sagalassos are 7 km from Ağlasun (as well as being its namesake) in the province of Burdur, on Mount Akdağ, in the Western Taurus mountains range, at an altitude of 1450-1700 metres.