| Official Name: | Pain Mahalleh-ye Qasemabad |
| Native Name: | پايين محله قاسم اباد |
| Settlement Type: | village |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Gilan |
| Subdivision Type2: | County |
| Subdivision Name2: | Rudsar |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Chaboksar |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Owshiyan |
| Population As Of: | 2006 |
| Population Total: | 487 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
Pain Mahalleh-ye Qasemabad (Persian: پايين محله قاسم اباد, also Romanized as Pā’īn Maḩalleh-ye Qāsemābād) is a village in Owshiyan Rural District, Chaboksar District, Rudsar County, Gilan Province, Iran. At the 2006 census, its population was 487, in 138 families.