| Official Name: | Qatar-e Aghaj-e Sofla |
| Native Name: | قطاراغاج سفلي |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Markazi |
| Subdivision Type2: | County |
| Subdivision Name2: | Farahan |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Saruq |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Saruq |
| Population As Of: | 2006 |
| Population Total: | 228 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.4381°N 49.4236°W |
Qatar-e Aghaj-e Sofla (Persian: قطاراغاج سفلي, also Romanized as Qaţār-e Āghāj-e Soflá; also known as Ghatar Aghaj, Qaţār Āghāj, and Qāţerqāj) is a village in Saruq Rural District, Saruq District, Farahan County, Markazi Province, Iran. At the 2006 census, its population was 228, in 53 families.