The Chumysh (Russian: Чумыш) is a river in Russia, a right branch of the Ob River. It enters the Ob 88 kilometres downriver from Barnaul. The Chumysh begins at the confluence of the Kara-Chumysh and the Tom-Chumysh rivers in Kemerovo Oblast. The Chumysh is 644 kilometres long, and it drains a basin of 23,900 square kilometres.
About 68 percent of its right-side basin is known as the Salair Ridge (Russian: Салаирский кряж) and the Pre-Salair plains.
