| Zavkhan River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mongolia |
| Subdivision Type2: | Aimags |
| Subdivision Name2: | Zavkhan, Govi-Altai |
| Length: | 670km (420miles) |
| Source1: | Buyant River |
| Source1 Location: | Khangai Mountains |
| Source2: | Shar-Us River |
| Mouth: | Khyargas Lake in Great Lakes Depression |
| Mouth Location: | Khyargas, Uvs, Mongolia |
| Tributaries Right: | Shurga River |
Zavkhan River (Mongolian: Завхан гол|Zawhan gol, in Mongolian pronounced as /ˈt͡saw̜χəɴ ɢɔɮ/) is a river in Mongolia. It flows from Khangai Mountains to Lake Khyargas, and has a draining area of over 30055order=flipNaNorder=flip. The river forms most of the border between the Govi-Altai and Zavkhan aimags. The length of the river is .[1]