| Tolbo District | |
| Native Name: | Толбо сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Bayan-Ölgii Province |
| Area Total Km2: | 2974.69 |
| Population As Of: | 2014 |
| Population Total: | 3939 |
| Timezone: | UTC + 7 |
| Utc Offset: | +7 |
Tolbo (Mongolian: Толбо, Stain) is a sum (district) of Bayan-Ölgii Province in western Mongolia. It is primarily inhabited by ethnic Kazakhs. As of 2014 it had a population of 3939 people.[1]
A large saline lake, Tolbo Lake, is located in the district, just north of the sum center. The lake was the site of the Battle of Tolbo Lake (1921) during the Russian Civil War where Bolsheviks and Mongolian allies defeated an army of White Russians.[2]