| Official Name: | Posht Tang-e Sofla |
| Native Name: | پشت تنگ سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ilam |
| Subdivision Type2: | County |
| Subdivision Name2: | Chardavol |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Helilan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Helilan |
| Population As Of: | 2006 |
| Population Total: | 255 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.7739°N 47.1006°W |
Posht Tang-e Sofla (fa|پشت تنگ سفلي, also Romanized as Posht Tang-e Soflá; also known as Lareh Vand, Poshteh Tang-e Soflá, and Posht Tang-e Lareh Vand) is a village in Helilan Rural District, Helilan District, Chardavol County, Ilam Province, Iran. At the 2006 census, its population was 255, in 55 families. The village is populated by Kurds.[1]