| Baatsagaan District | |
| Native Name: | Баацагаан 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: | Bayankhongor Province |
| Unit Pref: | Imperial |
| Area Total Km2: | 7447 |
| Population As Of: | 2006 |
| Population Total: | 3568 |
| Population Density Km2: | 0.48 |
| Timezone: | UTC+8 |
| Coordinates: | 45.5542°N 99.4356°W |
Baatsagaan (Mongolian: Баацагаан, Baa white) is a sum (district) of Bayankhongor Province in southern Mongolia. The area is 7447 km2, and the population was 3568 in 2006.
The center of this sum is Bayansair village, located 125 km from the administrative center of the province (aimak) - the city of Bayankhongor and 625 km from the capital of the country - Ulaanbaatar. The climate is sharply continental.[1]