Marco da Montegallo was a 15th-century Italian physician and Franciscan friar born in Montegallo. After practicing medicine in Ascoli Piceno, he entered the religious life following the annulment of a marriage he had entered under parental pressure. He became a prominent preacher and a dedicated servant to the impoverished, eventually establishing charitable institutions to provide financial relief to those in need. He died in Vicenza in 1496 after falling ill during a period of Lenten fasting.