| Official Name: | Hasanabad-e Pain |
| Native Name: | حسن ابادپايين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Birjand |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Baqeran |
| Population As Of: | 2006 |
| Population Total: | 56 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 32.6958°N 59.3344°W |
Hasanabad-e Pain (Persian: حسن ابادپايين, also Romanized as Ḩasanābād-e Pā’īn) is a village in Baqeran Rural District, in the Central District of Birjand County, South Khorasan Province, Iran. At the 2006 census, its population was 56, in 18 families.