Kostiantynivka (Ukrainian:Костянтинівка, Russian:Константиновка) is an industrial city in the Donetsk Oblast (province) of eastern Ukraine, on the Kryvyi Torets River. Administratively, it is incorporated as a city of oblast significance. It also serves as the administrative center of Kostiantynivka Raion (district), though it does not belong to it. It's also known as Kostyantynivka or Konstantinovka. It developed in the Soviet era into a major centre for the production of iron, zinc, steel and glass. Population: 77,066(2013 est.); 95,111 (2001).