The Amgun (Russian: Амгу́нь) is a river in Khabarovsk Krai, Russia that flows northeast and joins the river Amur from the left, 146 km upstream from its outflow into sea.

The area of its basin is 55,500 square kilometres (21,400 sq mi).

The Baikal Amur Mainline railway enters the Amgun valley from the Dusse-Alin Tunnel and follows the river 180 kilometres (110 mi) northeast to Beryozovy where it turns southeast to Komsomolsk-on-Amur.

At its mouth is the village of Tyr which was a Chinese fort during the Ming and Qing dynasties.

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