The Castle of Alcantarilha is a medieval fortress and its remnant walls in Portugal, in the civil parish of Alcantarilha, municipality of Silves, in the Portuguese Algarve region of southwestern Iberia. It is a little-known monument, now in ruins, used for the protection of the people of the village and surrounding area from attacks by north African pirates.

• http://en.wikipedia.org/wiki/Castle of Alcantarilha