The Tromyogan (Russian: Тромъёган) is a river in Khanty-Mansi Autonomous Okrug, Russia, a tributary of the Ob.

It is 581 kilometres (361 mi) long, and has a drainage basin of 55,600 square kilometres (21,500 sq mi).

[1] The Tromyogan is a right tributary of the Ob river.

The river flows to the north of the Vatinsky Yogan basin.

[2] The main tributary of the Tromyogan is the 544 km (338 mi) long Agan on the right.