| Official Name: | Mostafalu |
| Native Name: | مصطفي لو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ardabil |
| Subdivision Type2: | County |
| Subdivision Name2: | Khalkhal |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Sanjabad-e Sharqi |
| Population As Of: | 2006 |
| Population Total: | 496 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.7792°N 48.5156°W |
Mostafalu (Persian: مصطفي لو, also Romanized as Moşţafálū and Moşţafālū; also known as Mustafali) is a village in Sanjabad-e Sharqi Rural District, in the Central District of Khalkhal County, Ardabil Province, Iran. At the 2006 census, its population was 496, in 91 families.