| Official Name: | Lojunk-e Sofla |
| Native Name: | لجونك سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Sarbisheh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Doreh |
| Population As Of: | 2006 |
| Population Total: | 158 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.5472°N 60.4192°W |
Lojunk-e Sofla (Persian: لجونك سفلي, also romanized as Lojūnk-e Soflá; also known as Lojeng-e Soflá, Lajnak, Lojeng-e Pā’īn, Lojong Pā’īn, and Lūjung) is a village in Doreh Rural District, in the Central District of Sarbisheh County, South Khorasan Province, Iran. At the 2006 census, its population was 158, in 32 families.