Sir James Roualeyn Hovell-Thurlow-Cumming-Bruce PC (9 March 1912 – 12 June 2000) was a British barrister and judge who was a Lord Justice of Appeal from 1977 to 1985.
Roualeyn Cumming-Bruce was the third son of the Charles Edward Hovell-Thurlow-Cumming-Bruce, 6th Baron Thurlow, and the younger of identical twin boys. His grandfather was a British Liberal politician who was Paymaster-General in 1886. Earlier relations were Bishop of Durham and Lord Chancellor. His eldest brother Harry became 7th Baron Thurlow in 1952, and his elder twin brother Francis became 8th Baron Thurlow in 1971.
Roualeyn was educated at Shrewsbury School and Magdalene College, Cambridge, where he took a first in classics. He became an honorary Fellow at Magdalene in 1977. He was called to the Bar at Middle Temple in 1937, where he became a Bencher in 1959 and was Treasurer in 1975.
In the Second World War, he served in the Royal Artillery in North Africa and the Middle East, becoming a lieutenant colonel.
He resumed his mixed legal practice after the war. He was Chancellor of the Diocese of Ripon from 1954 to 1957, Recorder of Doncaster from 1957 to 1958 and Recorder of York from 1958 to 1961. He was appointed Junior Counsel to the Treasury (Common Law) in 1959.