| Uilgan River | |
| Pushpin Map: | Mongolia |
| Pushpin Map Caption: | Location of the mouth in Mongolia |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mongolia |
| Subdivision Type2: | Aimag |
| Subdivision Name2: | Khövsgöl |
| Subdivision Type3: | Region |
| Subdivision Name3: | Tsagaan-Üür Sum |
| Source1 Coordinates: | 50.8417°N 102.1292°W |
| Mouth: | Üür River |
| Mouth Coordinates: | 50.4778°N 101.7417°W |
| Progression: | Üür River→ |
Uilgan River (Mongolian: Уйлган гол) is a river in the Tsagaan-Üür Sum of Khövsgöl Aimag in Mongolia.
It starts in the confluence of several smaller rivers near the Russian border,[1] and discharges into the Üür River a bit downriver from the Tsagaan-Üür sum center and the mouth of the Arigiin River.[2]