English novelist, playwright, and critic, a distinguished writer of refined prose who stood apart from the main literary trends of his time.

Morgan was the son of a civil engineer, and he entered the Royal Navy in 1907; his first novel, The Gunroom (1919), concerns the mistreatment of midshipmen. From 1926 he worked on the editorial staff of The Times of London, serving as the chief drama critic. During World War II he served with the Admiralty.

In My Name Is Legion (1925), Morgan reveals a preoccupation with the conflict between the spirit and the flesh and a predilection for a form of secular mysticism. His subsequent novels include Portrait in a Mirror (1929), The Fountain (1932), Sparkenbrooke (1936), The Voyage (1940), The Empty Room (1941), and The Judge's Story (1947), which exhibits his subtle analysis of motive and character, as well as his narrative skill. Morgan also wrote three successful plays—The Flashing Stream (1938), The River Line (1949), and The Burning Glass (1953).