The Anyuy (Russian: река Аню́й), also known as Onyuy (Онюй) or Dondon (Дондон) is a river in the Khabarovsk Krai in Russia.

It originates on slope of Tordoki Yani in the Sikhote-Alin mountain range, and falls into the Amur between Khabarovsk and Komsomolsk-on-Amur.

According to French Jesuit geographers travelling on the Ussuri and the Amur in 1709, the Dondon River (Tondon, in contemporary accounts) formed the border between the lands populated by the people known as Yupi Tartars (which is the traditional Chinese name for the Nanai people and related groups), living on the Ussury and the Amur south of the Dondon, and the people whose name was transcribed into French as Ke tcheng, living on the Amur from the mouth of the Dondon downstream.

In 1999, a significant portion of the Anyuy basin was incorporated into the creation of Anyuysky National Park, one of the major protected areas of the Russian Federation.

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