| Official Name: | Kalus-e Sofla |
| Native Name: | كالوس سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kohgiluyeh and Boyer-Ahmad |
| Subdivision Type2: | County |
| Subdivision Name2: | Boyer-Ahmad |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Sarrud-e Jonubi |
| Population As Of: | 2006 |
| Population Total: | 264 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 30.7036°N 51.4389°W |
Kalus-e Sofla (fa|كالوس سفلي, also Romanized as Kālūs-e Soflá; also known as Kālūs-e Pā’īn and Kālūs Pā’īn) is a village in Sarrud-e Jonubi Rural District, in the Central District of Boyer-Ahmad County, Kohgiluyeh and Boyer-Ahmad Province, Iran. At the 2006 census, its population was 264, in 55 families.