Gaziosmanpaşa is a developing working class municipality and district of Istanbul, Turkey, on its European side. Its area is 12 km2, and its population is 495,998 (2022). With a population of almost 500,000, it is one of the most populous districts. Esenler and Bayrampaşa are west, Sultangazi is north and Eyüp is south and east of the district.