Ataşehir (Turkish pronunciation: [ataˈʃehiɾ]) is a municipality and district of Istanbul, Turkey. Its area is 25 km, and its population is 423,127 (2022). It is located at the junction of the O-2 and O-4 motorways on the Anatolian (Asian) side of Istanbul. Its neighbours are the districts of Ümraniye to the north, Sancaktepe to the northeast, Maltepe to the east, Kadıköy to the south and Üsküdar to the west.
Since 2023, Ataşehir is home to the Istanbul Financial Center (IFC), where the new headquarters of the state-owned Turkish banks, such as the Turkish Central Bank, Ziraat Bank, VakıfBank and Halkbank, are located. Until 2023, the headquarters of these banks were in Ankara. As of 2024, the tallest buildings in Ataşehir are the 352 m (1,154 ft 10 in) Turkish Central Bank Tower, which is followed by Metropol Istanbul Tower A (70 floors / 301 metres including its twin spires).