John II (Catalan: Joan II, Aragonese: Chuan II and Basque: Joanes II), called the Great (el Gran) or the Faithless (el Sense Fe) (29 June 1398 – 20 January 1479), was the King of Navarre through his wife (jure uxoris) from 1425 and the King of Aragon in his own right from 1458 until his death.
He was the son of Ferdinand I and his wife Eleanor of Alburquerque.