| Official Name: | Hoseynabad-e Qajar |
| Native Name: | حسين ابادقاجار |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Tehran |
| Subdivision Type2: | County |
| Subdivision Name2: | Pakdasht |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Sharifabad |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Jamalabad |
| Population As Of: | 2006 |
| Population Total: | 33 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 35.4189°N 51.6942°W |
Hoseynabad-e Qajar (Persian: حسين ابادقاجار, also Romanized as Ḩoseynābād-e Qājār; also known as Ḩoseynābād and Ḩoseīnābād) is a village in Jamalabad Rural District, Sharifabad District, Pakdasht County, Tehran Province, Iran. At the 2006 census, its population was 33, in 10 families.