The Kazym is a river in Beloyarsky District, Khanty-Mansi Autonomous Okrug, Russia. It is 659 km long, with a drainage basin of 35600 km2. Its average discharge is 267 m3/s. The town of Beloyarsky is along the Kazym.

Course

The Kazym is a right tributary of the Ob. Its sources are in the Siberian Uvaly. It flows through the northern part of the West Siberian Plain meandering across a very swampy valley. There are numerous lakes in its basin, including the relatively large Sorum-Lor and the Saran-Kho-Lor. The Kazym river is fed mainly by snow. It freezes in early November and begins to thaw in late May.

Tributaries

The main tributaries of the Kazym are the 374 km long Amnya, the 285 km long Lykhn and the 156 km long Pomut on the left, as well as the 190 km long Sorum on the right.