The Alcázar de los Reyes Cristianos (Spanish for "Castle of the Christian Monarchs"), also known as the Alcázar of Córdoba, is a medieval Alcázar located in the historic centre of Córdoba (in Andalusia, Spain), next to the Guadalquivir River and near the Grand Mosque. The Alcázar takes its name (Arabic: القصر‎, translit. Al-Qasr, lit. 'The Palace'‎). The fortress served as one of the primary residences of Isabella I of Castile and Ferdinand II of Aragon.

It is a building of ordered military character to build by the king Alfonso XI of Castile in the year 1328, on previous constructions (the Al-Andalusian Alcázar, also previous residence of the Roman Governor and the Customs). The architectural ensemble has a sober character in its exterior and splendid in its interior, with the magnificent gardens and courtyards that maintain an Mudéjar inspiration.

The Alcázar has been declared a Cultural Interest Heritage since 1931.[1] It forms part of the Historic Center of Córdoba that was declared World Heritage by UNESCO in 1994.[2]