| Tarvagatai River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Mongolia |
| Subdivision Type2: | Aimag |
| Subdivision Name2: | Bulgan |
| Subdivision Type3: | Region |
| Subdivision Name3: | Teshig sum |
| Source1 Coordinates: | 49.7083°N 103.8667°W |
| Mouth: | Egiin Gol |
| Mouth Coordinates: | 49.7083°N 103.1042°W |
Tarvagatai River (mn|Тарвагатайн гол) is a river in the Teshig sum of Bulgan aimag in Mongolia. It starts about 30 km north of the sum center of Selenge sum in the Angarkhai mountain range,[1] and discharges into the Egiin Gol ca 55 km west of that.[2]