Sultanbeyli is a grey windswept working class suburb, slum, of Istanbul, Turkey on the Asian side, far from the city, inland from Kartal and Pendik. It has a population of 175,700 (2000 census), more than double the 1990 figure of 82,298.
Far outside the city, Sultanbeyli was farmland until very recently. In the 1940s and 1950s large properties from the Ottoman period were taken over and broken up into small plots for the settlement of Turks migrating in from Bulgaria. A village was built in the 50s and one of the roads from Ankara passed through.