| Official Name: | Shahrestanak |
| Native Name: | شهرستانك |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Khusf |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Jolgeh-e Mazhan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Barakuh |
| Population As Of: | 2006 |
| Population Total: | 202 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.6978°N 59.2314°W |
Shahrestanak (Persian: شهرستانك, also Romanized as Shahrestānak and Shahristānak) is a village in Barakuh Rural District, Jolgeh-e Mazhan District, Khusf County, South Khorasan Province, Iran. At the 2006 census, its population was 202, with 70 families.