| Official Name: | Duk |
| Native Name: | دوك |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mazandaran |
| Subdivision Type2: | County |
| Subdivision Name2: | Qaem Shahr |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Nowkand Kola |
| Population As Of: | 2006 |
| Population Total: | 675 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.5311°N 52.8519°W |
Duk (fa|دوك, also Romanized as Dūk; also known as Dūk-e Bālā) is a village in Nowkand Kola Rural District, in the Central District of Qaem Shahr County, Mazandaran Province, Iran. At the 2006 census, its population was 675, in 192 families.