| Official Name: | Posht Sara |
| Native Name: | پشتسرا |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gilan |
| Subdivision Type2: | County |
| Subdivision Name2: | Shaft |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Jirdeh |
| Population As Of: | 2006 |
| Population Total: | 411 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.1369°N 49.4114°W |
Posht Sara (Persian: پشتسرا, also Romanized as Posht Sarā and Posht Serā) is a village in Jirdeh Rural District, in the Central District of Shaft County, Gilan Province, Iran. At the 2006 census, its population was 411, in 103 families.