Kostiantynivka (Ukrainian: Костянтинівка, Russian: Константиновка) is an industrial city in the Donetsk Oblast (province) of eastern Ukraine, on the Krivoy Torets River, the center of Kostiantynivka Raion (district). 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. As of 2001, the population is 95,111.