| Official Name: | Hermostan |
| Native Name: | همستان |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Isfahan |
| Subdivision Type2: | County |
| Subdivision Name2: | Fereydunshahr |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Pishkuh-e Mugui |
| Population As Of: | 2006 |
| Population Total: | 10 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.0142°N 49.7608°W |
Hermostan (Persian: همستان, also Romanized as Hermostān; also known as Hermūstān) is a village in Pishkuh-e Mugui Rural District, in the Central District of Fereydunshahr County, Isfahan Province, Iran. At the 2006 census, its population was 10, in 5 families.