| Official Name: | Rud-e Hasan-e Sofla |
| Native Name: | رودحسن سفلي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Hamadan |
| Subdivision Type2: | County |
| Subdivision Name2: | Nahavand |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Shaban |
| Population As Of: | 2006 |
| Population Total: | 73 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.1244°N 48.3717°W |
Rud-e Hasan-e Sofla (Persian: رودحسن سفلي, also Romanized as Rūd-e Ḩasan-e Soflá and Rūd Ḩasan-e Soflá; also known as Kaleh Mar Sofla, Kalleh Mār, Kalleh Mār-e Pā’īn, and Kalleh Mār-e Soflá) is a village in Shaban Rural District, in the Central District of Nahavand County, Hamadan Province, Iran. At the 2006 census, its population was 73, in 20 families.