| Official Name: | Kohneh Deh |
| Native Name: | كهنه ده |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Alborz |
| Subdivision Type2: | County |
| Subdivision Name2: | Karaj |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Asara |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Nesa |
| Population As Of: | 2006 |
| Population Total: | 131 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Coordinates: | 36.1142°N 51.2764°W |
Kohneh Deh (Persian: كهنه ده) is a village in Nesa Rural District, Asara District, Karaj County, Alborz Province, Iran. At the 2006 census, its population was 131, in 37 families.