The Kazym (Russian: Казы́м) is a river in Beloyarsky District, Khanty-Mansi Autonomous Okrug, Russia. It is 659 kilometres long, with a drainage basin of 35,600 square kilometres. Its average discharge is 267 cubic metres per second.
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.
