| Adaatsag District | |
| Native Name: | Адаацаг сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Dundgovi Province |
| Area Total Km2: | 3,309 |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Adaatsag (Mongolian: Адаацаг) is a sum (district) of Dundgovi Province in central Mongolia. In 2007, its population was 3,238.[1]