Michael Anthony Fleming, O.S.F. (c. 1792 – July 14, 1850) was an Irish-born Friar Minor who served as the Roman Catholic Church bishop of the Diocese of St. John's, Newfoundland. He was principally responsible for changing a small mission with several priests in four parishes into a large diocese with over 40,000 congregants and was the single most influential Irish immigrant to come to the Colony of Newfoundland in the 19th century. He was the principal creator of the Roman Catholic Cathedral of St. John the Baptist in St. John's.