The Irgiz (Russian: Иргиз) is a 593-kilometre (368 mi) long river in Aktobe and Kostanay regions of Kazakhstan, a right tributary of the Turgai River.
Coordinates: 48°15′28″N 62°01′20″E / 48.2579°N 62.0222°E / 48.2579; 62.0222