| Official Name: | Qarahlu |
| Native Name: | قره لو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ardabil |
| Subdivision Type2: | County |
| Subdivision Name2: | Meshgin Shahr |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Arshaq |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Arshaq-e Markazi |
| Population As Of: | 2006 |
| Population Total: | 228 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 38.6172°N 48.2286°W |
Qarahlu (Persian: قره لو, also Romanized as Qarahlū) is a village in Arshaq-e Markazi Rural District, Arshaq District, Meshgin Shahr County, Ardabil Province, Iran. At the 2006 census, its population was 228, in 47 families.