| Official Name: | Sar Asiab |
| Native Name: | سراسياب |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Isfahan |
| Subdivision Type2: | County |
| Subdivision Name2: | Natanz |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Emamzadeh |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Emamzadeh Aqaali Abbas |
| Population As Of: | 2006 |
| Population Total: | 165 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.6622°N 51.96°W |
Sar Asiab (Persian: سراسياب, also Romanized as Sar Āsīāb; also known as Darb-e Āsyāb-e Bād) is a village in Emamzadeh Aqaali Abbas Rural District, Emamzadeh District, Natanz County, Isfahan Province, Iran. At the 2006 census, its population was 165, in 48 families.