| Official Name: | Siah Darreh 1 Farhadi |
| Native Name: | سياه دره 1 فرهادي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Lorestan |
| Subdivision Type2: | County |
| Subdivision Name2: | Dowreh |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Chegeni |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Teshkan |
| Population As Of: | 2006 |
| Population Total: | 129 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 33.5756°N 47.8614°W |
Siah Darreh 1 Farhadi (Persian: سياه دره 1 فرهادي, also Romanized as Sīāh Darreh 1 Farhādī; also known as Sīāh Darreh-ye Farhādī and Sīāh Darreh-ye Yek) is a village in Teshkan Rural District, Chegeni District, Dowreh County, Lorestan Province, Iran. At the 2006 census, its population was 129, in 29 families.