Gzhat (Russian: Гжать) is a river in Smolensk Oblast, Russia. It is 113 km long, with a drainage basin of 2370 km². The town of Gagarin lies by the Gzhat River.
Coordinates: 55°44′55″N 34°47′48″E / 55.7486°N 34.7967°E / 55.7486; 34.7967