| Tsagaannuur District | |
| Native Name: | Цагааннуур сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Selenge Province |
| Area Total Km2: | 3814.72 |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Tsagaannuur (Mongolian: Цагааннуур, white lake) is a sum (district) of Selenge Province in northern Mongolia. In 2008, its population was 4,257.[1]