| Official Name: | Mehdiabad-e Bozorg |
| Native Name: | مهدي ابادبزرگ |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Qazvin |
| Subdivision Type2: | County |
| Subdivision Name2: | Qazvin |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Eqbal-e Gharbi |
| Population As Of: | 2006 |
| Population Total: | 1,359 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 36.1711°N 49.8794°W |
Mehdiabad-e Bozorg (Persian: مهدي ابادبزرگ, also Romanized as Mehdīābād-e Bozorg; also known as Mehdīābād, Ḩājjīābād, Mekhtyabad, and Mihdiābād) is a village in Eqbal-e Gharbi Rural District, in the Central District of Qazvin County, Qazvin Province, Iran. At the 2006 census, its population was 1,359, in 317 families.