| Castellazo | |
| Settlement Type: | Locality |
| Pushpin Map: |
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| Pushpin Label: | Castellazo |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Province of Huesca |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Aínsa-Sobrarbe |
| Population Total: | 20 |
| Coordinates: | 42.3331°N 0.0597°W[1] |
| Elevation M: | 922 |
| Postal Code Type: | Postal code |
Castellazo is a locality located in the municipality of Aínsa-Sobrarbe, in Huesca province, Aragon, Spain. As of 2020, it has a population of 20.[2]
Castellazo is located 87km east-northeast of Huesca.