(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.
Diogo was the son of Mateus Coelho da Costa, Captain-major of the island of Flores, and his wife, Catarina de Fraga Rodovalho.
Little is known of his infancy and childhood; Diogo wrote that his first studies occurred in the city of Angra, where he most likely entered the Friars Minor and received his initial ecclesiastical training.
Diogo became the Guardian of the Friary of São Francisco in Praia da Vitoria on the island of Terceira in 1627, where he received a license to preach in 1629.