| Official Name: | Mashu |
| Native Name: | مشو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Golestan |
| Subdivision Type2: | County |
| Subdivision Name2: | Ramian |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Fenderesk |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Fenderesk-e Jonubi |
| Population As Of: | 2006 |
| Population Total: | 146 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.9667°N 54.9833°W |
Mashu (Persian: مشو, also Romanized as Mashū) is a village in Fenderesk-e Jonubi Rural District, Fenderesk District, Ramian County, Golestan Province, Iran. At the 2006 census, its population was 146, in 37 families.