John Courtenay Trewin OBE (4 December 1908 – 16 February 1990) was a British journalist, writer and drama critic.
He was educated at Plymouth College and in 1926 joined the Western Independent as a cub reporter.
He moved to London in 1932 and joined the Morning Post, transferring to The Observer in 1937.
His also wrote a drama column for The Listener (1951–57), and contributed regular notices to Punch (1944–45), John O'London's Weekly (1945–54), The Sketch (1947–59), the Illustrated London News (1947–88), The Lady (from 1949) and the Birmingham Post.
He was appointed Officer of the Order of the British Empire (OBE) in 1981 for services to theatre.