| Official Name: | Esas |
| Native Name: | اساس |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Savadkuh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Rastupey |
| Population As Of: | 2016 |
| Population Total: | 332 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 36.1425°N 53.065°W |
Esas (fa|اساس, also Romanized as Esās) is a village in Rastupey Rural District, in the Central District of Savadkuh County, Mazandaran Province, Iran. At the 2016 census, its population was 332, in 128 families, up from 274 people in 2006.