| Official Name: | Tazehnab-e Sofla |
| Native Name: | Persian: تازهناب سفلی |
| 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: | 122 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.0978°N 48.3153°W |
Tazehnab-e Sofla (Persian: تازهناب سفلی, also Romanized as Tāzehnāb-e Soflá; also known as Tāzānaū, Tāzānū, Tazeh Nāb, Tāzeh Nāb-e Pā’īn, Tāzenāb, Taznāb, Tāznāb, Tāznāb-e Pā’īn, Tāznāb-e Soflá, and Tāznāb Tāf) is a village in Shaban Rural District, in the Central District of Nahavand County, Hamadan Province, Iran. At the 2006 census, its population was 122, in 33 families.