| Official Name: | Sefid Ab |
| Native Name: | سفيداب |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ardabil |
| Subdivision Type2: | County |
| Subdivision Name2: | Khalkhal |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Khvoresh Rostam |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Khvoresh Rostam-e Jonubi |
| Population As Of: | 2006 |
| Population Total: | 344 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.2036°N 48.5703°W |
Sefid Ab (Persian: سفيداب, also Romanized as Sefīd Āb; also known as Āsbū) is a village in Khvoresh Rostam-e Jonubi Rural District, Khvoresh Rostam District, Khalkhal County, Ardabil Province, Iran. At the 2006 census, its population was 344, in 80 families.