| Official Name: | Chah Balu |
| Native Name: | چاه بلو |
| Settlement Type: | village |
| Pushpin Map: | Iran |
| Mapsize: | 150px |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Khorasan |
| Subdivision Type2: | County |
| Subdivision Name2: | Tabas |
| Subdivision Type3: | Bakhsh |
| Subdivision Name3: | Dastgerdan |
| Subdivision Type4: | Rural District |
| Subdivision Name4: | Kuh Yakhab |
| Population As Of: | 2006 |
| Population Total: | 47 |
| Population Density Km2: | auto |
| Timezone: | IRST |
| Utc Offset: | +3:30 |
| Timezone Dst: | IRDT |
| Utc Offset Dst: | +4:30 |
| Coordinates: | 34.9375°N 57.4017°W |
Chah Balu (fa|چاه بلو, also Romanized as Chāh Balū) is a village in Kuh Yakhab Rural District, Dastgerdan District, Tabas County, South Khorasan Province, Iran. At the 2006 census, its population was 47, in 12 families.