Alfonso of Aragon may refer to:
Kings of Aragon
- Alfonso I the Battler (r. 1104–1134)
- Alfonso II the Chaste or the Troubadour (r. 1164–1196)
- Alfonso III the Liberal or the Free (r. 1285–1291)
- Alfonso IV the Kind (r. 1327–1336)
- Alfonso V the Magnanimous (r. 1416–1458)
Princes (Infantes) of Aragon
- Alfonso (1332–1412), duke of Gandia, count of Denia, count of Ribagorza, marquis of Villena, constable of Castile
- Alfonso (1358–1422), duke of Gandia, count of Denia, count of Ribagorza
- Alfonso (1417–1495), duke of Villahermosa, count of Ribagorza and Cortes, baron of Arenos, grand master of the Order of Calatrava
- Alonso or Alfonso (1470–1520), archbishop of Zaragoza and Valencia and lt. general of Aragon
- Alfonso (1481–1500), duke of Bisceglie and prince of Salerno
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