The Castle of Cardona (; , ) is arguably the most important medieval fortress in the Principality of Catalonia. It is situated on a hill overlooking the river valley of the Cardener and the town of Cardona. In 1714, even after a Bourbon siege destroyed a good part of the castle's walls, the garrison was one of the last to surrender to the Bourbon troops which supported Philip V. As the Bourbons and their heirs would go on to suppress Catalonian national identity, the fort has become significant to Catalonian nationalism.