| Bayan-Uul District | |
| Native Name: | Баян-Уул сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Dornod Province |
| Area Total Km2: | 5,623 |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Bayan-Uul (Mongolian: Баян-Уул, Rich mountain) is a sum (district) of Dornod Province in eastern Mongolia. Ereen settlement is 26 km NW from Bayan-Uul sum center. In 2009, its population was 4,451.[1]