Brigadier Cyril Nelson Barclay CBE DSO (20 January 1896 – 30 January 1979) was a British soldier, editor, and author. He served with the Cameronians (Scottish Rifles) in two World Wars, rising to the rank of brigadier, and after retiring from the army in 1946 was editor of The Army Quarterly and Defence Journal from 1950 to 1966, co-editor of Brassey's Annual: The Armed Forces Year Book from 1950 to 1969, and contributed articles to encyclopedias and periodicals.