The Tromyogan (Russian: Тромъёган) is a river in Khanty-Mansi Autonomous Okrug, Russia, a tributary of the Ob. It is 581 kilometres long, and has a drainage basin of 55,600 square kilometres.
The Tromyogan is a right tributary of the Ob river. It has its sources in the Siberian Uvaly. The river flows to the north of the Vatinsky Yogan basin.
The main tributary of the Tromyogan is the 544 km (338 mi) long Agan on the right.
