| Castañoso | |
| Settlement Type: | Locality |
| Pushpin Map: | Spain Province of León#Spain Castile and León#Spain |
| Pushpin Label: | Castañoso |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Province of León |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Balboa, León |
| Population Total: | 16 |
| Coordinates: | 42.7256°N -6.9031°W[1] |
| Elevation M: | 866 |
| Postal Code Type: | Postal code |
Castañoso is a locality located in the municipality of Balboa, León, in León province, Castile and León, Spain. As of 2020, it has a population of 16.[2]
Castañoso is located 153km west of León, Spain.