| Bayan-Ovoo District | |
| Native Name: | Баян-Овоо сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Pushpin Map: | Mongolia |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Mongolia |
| Subdivision Type: | Country |
| Subdivision Name: |  Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Khentii |
| Area Total Km2: | 3,381 |
| Population As Of: | 2010 |
| Population Total: | 1,581 |
| Timezone: | UTC+8 |
| Utc Offset: | +8 |
| Coordinates: | 47.7858°N 112.1164°W |
| Elevation Footnotes: | [1] |
| Elevation M: | 921 |
| Elevation Ft: | 3024 |
Bayan-Ovoo (Mongolian: Баян-Овоо is a sum (district) of Khentii Province in eastern Mongolia. The sum had a population in 2008 of 1,581[2] and an area of 3,381 km².
Bayan-Ovoo has a continental climate (Köppen climate classification Dwb) with warm summers and severely cold winters. Most precipitation falls in the summer as rain, with some snow in autumn and spring. Winters are quite dry, with occasional light snow.