| Castle of Alter Pedroso | |
|---|---|
Castelo de Alter Pedroso | |
| Portalegre, Alto Alentejo, Alentejo in Portugal | |
 Ruins and vestiges of the long-forgotten castle of Alter Pedroso | |
| Coordinates | 39°11′21″N 7°37′22″W / 39.18917°N 7.62278°W |
| Type | Castle |
| Site information | |
| Owner | Portuguese Republic |
| Open to the public | Public |
| Site history | |
| Materials | Masonry, Taipa |
The Castle of Alter do Chão (Portuguese: Castelo de Alter do Chão) is a Portuguese medieval castle in civil parish of Alter do Chão, in the municipality of Alter do Chão, in the district of Portalegre.