| Official Name: | Mazarostaq |
| Native Name: | مازارستاق |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Sari |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Chahardangeh |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Chahardangeh |
| Population As Of: | 2006 |
| Population Total: | 67 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.2564°N 53.4256°W |
Mazarostaq (Persian: مازارستاق, also Romanized as Māzārostāq) is a village in Chahardangeh Rural District, Chahardangeh District, Sari County, Mazandaran Province, Iran. At the 2006 census, its population was 67, in 22 families.