| Official Name: | Gerdah Sang |
| Native Name: | گرده سنگ |
| Settlement Type: | Village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | East Azerbaijan |
| Subdivision Type2: | County |
| Subdivision Name2: | Ahar |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Central |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Vargahan |
| Population As Of: | 2006 |
| Population Total: | 72 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 38.6225°N 47.2253°W |
| Native Name Lang: | fa |
Gerdah Sang (Persian: گرده سنگ) is a village in Vargahan Rural District, in the Central District of Ahar County, East Azerbaijan Province, Iran. At the 2006 census, its population was 72, in 13 families.