| Official Name: | Khalaj-e Sofla |
| Native Name: | خلج سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Razavi Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Kalat |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Kabud Gonbad |
| Population As Of: | 2006 |
| Population Total: | 82 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.0028°N 59.8528°W |
Khalaj-e Sofla (Persian: خلج سفلي, also Romanized as Khalaj-e Soflá; also known as Khalaj-e Pā’īn) is a village in Kabud Gonbad Rural District, in the Central District of Kalat County, Razavi Khorasan Province, Iran. At the 2006 census, its population was 82, in 20 families.