| Official Name: | Qasemabad-e Bozorg |
| Native Name: | Persian: قاسمآباد بزرگ |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Subdivision Type: | Country |
| Subdivision Name: | Iran |
| Subdivision Type1: | Province |
| Subdivision Name1: | Alborz |
| Subdivision Type2: | County |
| Subdivision Name2: | Savojbolagh |
| Subdivision Type3: | District |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Saidabad |
| Population As Of: | 2016 |
| Population Total: | 6142 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 35.9231°N 50.6831°W |
| Coordinates Footnotes: | [1] |
Qasemabad-e Bozorg (Persian: قاسمآباد بزرگ) is a village in Saidabad Rural District of the Central District of Savojbolagh County, Alborz province, Iran.
At the time of the 2006 National Census, the village's population was 3,727 in 894 households, when it was in Tehran province.[2] The 2016 census measured the population of the village as 6,142 people in 1,700 households, by which time the county had been separated from the province in the establishment of Alborz province.[3] It was the most populous village in its rural district.[4]