| Official Name: | Ahar |
| Native Name: | Persian: آهار |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | Tehran |
| Subdivision Type2: | County |
| Subdivision Name2: | Shemiranat |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Rudbar-e Qasran |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Rudbar-e Qasran |
| Population As Of: | 2006 |
| Population Total: | 702 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 35.9361°N 51.4611°W |
| Elevation M: | 2100 |
Ahar (fa|آهار, also Romanized as Āhār) is a village in Rudbar-e Qasran Rural District, Rudbar-e Qasran District, Shemiranat County, Tehran Province, Iran. At the 2006 census, its population was 702, in 232 families.