Alfonso I
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Alfonso I may refer to:
- Alfonso I of Asturias (739–757), called the Catholic (el Católico), the King of Asturias
- Afonso I of Portugal (1094–1195) (Afonso Henriques), the son of Henry of Burgundy
- Alfonso I of Aragon (1104–1134), known as Alfonso the Battler
- Alfonso V of Aragon (1396–1458), King of Naples as Alfonso I
- Afonso I of Kongo (1456–1543) the first Christian king of the Kingdom of Kongo
- Alfonso I d'Este, Duke of Ferrara (1476–1534)
- Alfonso XIII of Spain (1886–1941), known to French Legitimists as "Alphonse I"