| Uulbayan District | |
| Native Name: | Уулбаян сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sükhbaatar Province |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Uulbayan (Mongolian: Уулбаян, Mountain rich) is a sum (district) of Sükhbaatar Province in eastern Mongolia. In 2009, its population was 2,883.[1]