| Official Name: | Siyahtan |
| Native Name: | سياه تن |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gilan |
| Subdivision Type2: | County |
| Subdivision Name2: | Sowme'eh Sara |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Tulem |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Tulem |
| Population As Of: | 2006 |
| Population Total: | 493 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.2981°N 49.3858°W |
Siyahtan (Persian: سياه تن, also Romanized as Sīyāhtan) is a village in Tulem Rural District, Tulem District, Sowme'eh Sara County, Gilan Province, Iran. At the 2006 census, its population was 493, in 155 families.