| Official Name: | Biyabanak |
| Native Name: | بيابانك |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Semnan |
| Subdivision Type2: | County |
| Subdivision Name2: | Sorkheh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Lasgerd |
| Population As Of: | 2006 |
| Population Total: | 352 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 35.4125°N 53.2692°W |
Biyabanak (Persian: بيابانك, also Romanized as Bīyābānaḵ) is a village in Lasgerd Rural District, Sorkheh District, in the Central District of Sorkheh County, Iran. At the 2006 census, its population was 352, in 131 families.