| Guchin-Us Soum | |
| Native Name: | Гучин-Ус сум |
| Native Name Lang: | mn |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Subdivision Type1: | Province |
| Subdivision Name1: | Övörkhangai Province |
| Timezone: | UTC + 8 |
| Utc Offset: | +8 |
Guchin-Us (Mongolian: Гучин-Ус, meaning is Thirty water) is a sum (district) of Övörkhangai Province in southern Mongolia. It had an estimated 2,260 inhabitants in 2008.[1]
The town of Arguut, 104 km from the Province capital Arvaikheer, is the administrative center of the soum, but mostly it is called "Guchin Us" as well.[2]
There are several prehistoric rock paintings and buddhist inscriptions in the north-east of the town, close to the unpaved road to Arvaikheer.