| Castle of Campo Maior | |
|---|---|
Castelo de Campo Maior | |
| Portalegre, Alentejo, Alentejo in Portugal | |
 The castle and the small houses around its hilltop flanks | |
| Coordinates | 39°0′39.80″N 7°4′19.37″W / 39.0110556°N 7.0720472°W |
| Type | Castle |
| Site information | |
| Owner | Portuguese Republic |
| Operator | DRC Alentejo (Ordinance 829/2009; DR, Série II (163), 24 August 2009) |
| Open to the public | Public |
| Site history | |
| Built | c. 1230 |
| Materials | Quartzite, granite, schist, tile, calcium oxide mortar, stone, clay |
The Castle of Campo Maior (Portuguese: Castelo de Campo Maior) is a medieval military fortification, in the civil parish of São João Bapista, municipality of Campo Maior, part of a first line of defense in the Portuguese Alentejo, oriented towards Spain, in conjunction with the military forts of Ouguela, Elvas, Olivença and Juromenha. It is a walled bulwark of the modern era, highlighted by a Renaissance-era window in the northern tower of the castle. It has been listed as a National monument since 1911.