| Official Name: | Chah Gach-e Sofla |
| Native Name: | چاه گچ سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Fars |
| Subdivision Type2: | County |
| Subdivision Name2: | Mamasani |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Mahvarmilani |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Mishan |
| Population As Of: | 2006 |
| Population Total: | 116 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 29.9111°N 51.0211°W |
Chah Gach-e Sofla (Persian: چاه گچ سفلي, also Romanized as Chāh Gach-e Soflá; also known as Chāh Gachī) is a village in Mishan Rural District, Mahvarmilani District, Mamasani County, Fars Province, Iran. At the 2006 census, its population was 116, in 25 families.