| Official Name: | Kuhsar |
| Native Name: | كوهسار |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Nehbandan |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Shusef |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Arabkhaneh |
| Population As Of: | 2006 |
| Population Total: | 41 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.2806°N 59.3044°W |
Kuhsar (Persian: كوهسار, also Romanized as Kūhsār, Koohsar, and Kūhsar; also known as Gūsār) is a village in Arabkhaneh Rural District, Shusef District, Nehbandan County, South Khorasan Province, Iran. At the 2006 census, its population was 41, in 11 families.