| Official Name: | Posht Giaban |
| Native Name: | پشت گيابان |
| Settlement Type: | village |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sistan and Baluchestan |
| Subdivision Type2: | County |
| Subdivision Name2: | Khash |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Poshtkuh |
| Population As Of: | 2006 |
| Population Total: | 175 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
Posht Giaban (Persian: پشت گيابان, also Romanized as Posht Gīābān) is a village in Poshtkuh Rural District, in the Central District of Khash County, Sistan and Baluchestan Province, Iran. At the 2006 census, its population was 175, in 30 families.