| Official Name: | Posht Darb-e Vosta |
| Native Name: | پشت درب وسطي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Khuzestan |
| Subdivision Type2: | County |
| Subdivision Name2: | Gotvand |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Aghili |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Aghili-ye Shomali |
| Population As Of: | 2006 |
| Population Total: | 196 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.2169°N 48.9031°W |
Posht Darb-e Vosta (Persian: پشت درب وسطي, also romanized as Posht Darb-e Vostá; also known as Dareynak and Darnīk) is a village in Aghili-ye Shomali Rural District, Aghili District, Gotvand County, Khuzestan Province, Iran. At the 2006 census, its population was 196, in 30 families.