| Mönkh Saridag | |
| Photo Size: | 300 |
| Elevation M: | 3491 |
| Elevation Ref: | [1] |
| Prominence M: | 1578 |
| Listing: | Ultra |
| Map: | Mongolia#Russia Buryatia |
| Map Size: | 300 |
| Label Position: | right |
| Location: | Mongolia–Russia border |
| Range: | Sayan Mountains |
| Coordinates: | 51.7189°N 100.6147°W |
Mönkh Saridag (also spelled as Munku-Sardyk; Mongolian: Мөнх сарьдаг, lit. "eternal aiguille") is the highest mountain in the Sayan Mountains of Asia. It is 3491m (11,453feet) tall and is on the international border between Mongolia and Russia. It is also the highest mountain in Buryatia and the highest mountain in Mongolia's Khövsgöl Province. On the southern side, the tree line is at 2000 meters, on the northern side at 2200 meters.