| Official Name: | Karnachi |
| Native Name: | كرناچي |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kermanshah |
| Subdivision Type2: | County |
| Subdivision Name2: | Kermanshah |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Miyan Darband |
| Population As Of: | 2006 |
| Population Total: | 4,644 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.3842°N 47.0697°W |
Karnachi (Persian: كرناچي, also Romanized as Karnāchī; also known as Karnājī) is a village in Miyan Darband Rural District, in the Central District of Kermanshah County, Kermanshah Province, Iran. At the 2006 census, its population was 4,644, in 1,117 families.