Maginn is a surname. Notable people with the surname include:
Edward Maginn (born 1802), Irish Roman Catholic priest, advocate of Catholic Emancipation, supporter of Daniel O'Connell in the Repeal movement
Francis Maginn (1861–1918), Church of Ireland missionary and one of the co-founders of British Deaf Association
Matt Maginn, musician from Omaha, Nebraska
Simon Maginn (born 1961), British writer who has published five novels under his own name
William Maginn (1794–1842), journalist and miscellaneous writer, born in Cork
