Alfonso de Aragón y Foix (1332 - Gandia, 5 March 1412) [1] also called Alfonso I of Gandía "the old" and Alfonso IV of Ribagorza, was the eldest son of Count Peter of Ribagorza and Juana of Foix.

He was the grandson of James II of Aragon and cousin of Pedro IV "the Ceremonious".

Alfonso claimed the crown as senior male-line descendant of James II.

Alfonso died before the crisis was resolved by the Compromise of Caspe; his claim was inherited by his brother, Juan of Aragon and Foix.

From his marriage in 1355 with Violante Díaz de Arenós, daughter of Gonzalo Díaz de Arenós and his wife María Juana Cornell,8 he had the following children: