| Official Name: | Siasan |
| Native Name: | سياسان |
| Settlement Type: | village |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Ramsar |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Sakht Sar |
| Population As Of: | 2006 |
| Population Total: | 167 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
Siasan (Persian: سياسان, also Romanized as Sīāsān) is a village in Sakht Sar Rural District, in the Central District of Ramsar County, Mazandaran Province, Iran. At the 2006 census, its population was 167, in 45 families.