Diogo das Chagas, O.F.M. (Diogo of the Holy Wounds); (c. 1584 in Santa Cruz das Flores – c. 1661 in Angra do Heroísmo) was a Portuguese Franciscan friar and historian. He is best known as the author of Espelho Cristalino em Jardim de Várias Flores, an important resource on the colonization of the islands of the central and western groups of the Portuguese archipelago of his native region of the Azores after 1640.