Ralph Alexander Leigh CBE FBA (6 January 1915 – 22 December 1987) was a modern languages scholar, Fellow of Trinity College, Cambridge, and Professor of French in the University of Cambridge from 1973 to 1982, later Sandars Readership in Bibliography, in 1986–87.
Born to Jewish parents, he was educated at Raine's School for Boys in Bethnal Green, Queen Mary College, London, and the University of Paris (Sorbonne).
He served in the British Army during the Second World War from 1941, was commissioned as a Lieutenant in 1942, promoted Major, 1944, and returned to civilian life in 1946, when he was appointed a lecturer in the Department of French at the University of Edinburgh.
From 1969 to 1973 he was a Reader and Senior Research Fellow in the University of Cambridge, and in 1973 a visiting professor at the Sorbonne.
[1] Between 1965 and 1987 he edited more than forty volumes of the correspondence of Jean Jacques Rousseau, a work still in progress at his death.