| Official Name: | Sefid Mazgi |
| Native Name: | سفيدمزگي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gilan |
| Subdivision Type2: | County |
| Subdivision Name2: | Shaft |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Ahmadsargurab |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Ahmadsargurab |
| Population As Of: | 2006 |
| Population Total: | 949 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.0867°N 49.3317°W |
Sefid Mazgi (Persian: سفيدمزگي, also Romanized as Sefīd Mazgī) is a village in Ahmadsargurab Rural District, Ahmadsargurab District, Shaft County, Gilan Province, Iran. At the 2006 census, its population was 949, in 229 families.