The Tes River (Mongolian: Тэсийн гол; Tuvan: Тес-Хем;) is a river in northwestern Mongolia and southern Tuva, Russia.

The river then flows through Zavkhan (Mongolia), Tuva (Russia), next back to Uvs (Mongolia) before entering Uvs Lake.

The Tes River is primary source of the Uvs Lake.

A large section of the river, from where it enters the Uvs Province to its mound in the lake, is included in the Uvs Nuur Basin UNESCO World Heritage Site.

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