| Official Name: | Lak |
| Native Name: | لك |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Qazvin |
| Subdivision Type2: | County |
| Subdivision Name2: | Avaj |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central District |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Hesar-e Valiyeasr |
| Population As Of: | 2006 |
| Population Total: | 654 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 35.8831°N 48.9836°W |
Lak (Persian: لك, also Romanized as Laik; also known as Lak-e Bozorg) is a village in Hesar-e Valiyeasr Rural District, Central District, Avaj County, Qazvin Province, Iran. At the 2006 census, its population was 654, in 136 families.