Zavkhan River (Mongolian: Завхан гол, romanized: Zawhan gol, pronounced [ˈt͡saw̜χəɴ ɢɔɮ]) is a river in Mongolia.

It flows from Khangai Mountains to Lake Khyargas, and has a draining area of over 77,840 square kilometres (30,055 square miles).

The river forms most of the border between the Govi-Altai and Zavkhan aimags.

The length of the river is 670 kilometres (420 mi).

This article related to a river in Mongolia is a stub.