The Vasyugan (Russian: Васюга́н) is a river in the southern West Siberian Plain of Russia. It is a tributary of the Ob on the left side, and its course from its source in the Vasyugan Swamp is entirely within the Kargasok district of Tomsk Oblast.
The river is 1,082 kilometres long and is navigable upriver for 886 kilometres from the mouth. The Vasyugan drains a basin of 61,800 square kilometres.
