'''Alfonso I''' can refer to:
*[[Afonso I of Portugal]], (1094-1195) (Afonso Henriques)
*[[Afonso I of Kongo|Afonso I Mvemba a Nzinga of Kongo]], (1456-1543) the first Christian king of the Kingdom of Kongo and one of the first Black Africans of whom we have written documents in an European language
*[[Alfonso I of Asturias]], (739-757)
*[[Alfonso I (of Castile)]], (1040-1109) the first King of Castile to be called Alfonso, but better known as [[Alfonso VI of Castile]] as he was the sixth Alfonso in the line that started with Alfonso I of Asturius, and included another monarch of [[Asturias]] called Alfonso and three [[Kings of Leon]] called Alfonso.
*[[Alfonso I of Aragon]], (1104-1134)
*[[Alphonso I of Ferrara]], duke of Ferrara (15th century)
*[[Alfonso I of Naples]], also known as Alfonso V of Aragon

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