| Official Name: | Kolahduz |
| Native Name: | كلاهدوز |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Markazi |
| Subdivision Type2: | County |
| Subdivision Name2: | Shazand |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Zalian |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Pol-e Doab |
| Population As Of: | 2006 |
| Population Total: | 417 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.1139°N 49.4142°W |
Kolahduz (Persian: كلاهدوز, also Romanized as Kolāhdūz and Koleh Dūz; also known as Kolāb Dūz) is a village in Pol-e Doab Rural District, Zalian District, Shazand County, Markazi Province, Iran. At the 2006 census, its population was 417, in 104 families.