| Official Name: | Hammamlu-e Pain |
| Native Name: | حماملو پايين |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Zanjan |
| Subdivision Type2: | County |
| Subdivision Name2: | Zanjan |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Zanjanrud |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Zanjanrud-e Pain |
| Population As Of: | 2006 |
| Population Total: | 96 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 37.1203°N 48.0906°W |
Hammamlu-e Pain (Persian: حماملو پايين, also Romanized as Ḩammāmlū-e Pā’īn and Ḩammāmlū-e Pāeen) is a village in Zanjanrud-e Pain Rural District, Zanjanrud District, Zanjan County, Zanjan Province, Iran. At the 2006 census, its population was 96, in 21 families.