Michael Arthur Lewis (3 January 1890 – 27 February 1970) was a British naval historian, as well as a fiction writer, who was Professor of History and English at the Royal Naval College, Greenwich between 1934 and 1955.
Born in Freeland, Oxfordshire, Lewis was the second son of The Rev'd Victor Arthur Nicholas Lewis, a church of England clergyman, and his wife Mary Ann Clayton Lewis. He was educated at Uppingham School and studied at Trinity College, Cambridge, where he took a Bachelor of Arts degree with honours in 1912 and a Master of Arts in 1924.
During the First World War, he served in the Royal Marines from 1914 to 1919, becoming a lieutenant. On 5 August 1933, he married Muriel Doris Cruikshank with whom he had a son (the historian of early railways Michael J. T. Lewis) and a daughter.
Lewis spent his entire 42-year academic career in English naval colleges. In 1913, he was appointed an assistant master at the Royal Naval College, Osborne, remaining there until 1920, when he was transferred to the Royal Naval College, Dartmouth. In 1922, he was appointed assistant head of history and English at Dartmouth. Shortly after his marriage, he was appointed Professor of History and English in 1934 at the Royal Naval College, Greenwich, a position he held until his retirement in 1955. While holding that position, he was Director of the Sub-lieutenants General Education Course, 1946-1955 at Greewnich. Additionally, he was lecturer in English to the Royal Navy Staff College, 1943-1957, and in Naval history, 1945-1953. He was lecturer in naval history to the Royal Navy Senior Officers War Course, 1947-1953.