Claude Cahen (26 February 1909 – 18 November 1991) was a 20th-century French Marxist orientalist and historian.
He specialized in the studies of the Islamic Middle Ages, Muslim sources about the Crusades, and social history of the medieval Islamic society (works on Futuwa orders).
Claude Cahen was born in Paris to a French Jewish family.
Cahen was a member of the French Communist Party from the 1930s until 1960, and remained an active Marxist afterwards.
Despite his origins, he neither self-identified as Jewish nor supported the State of Israel.In 1954 he published "An Introduction to the First Crusade" in the Oxford journal Past and Present.
Cahen has been called "the doyen of Islamic social history and one of the most influential Islamic historians of [his] century," and "the best historian of the Middle East in the twentieth century." Mark Cohen describes him as a distinguished Islamic historian.
He was a prisoner of war in World War II.
The Festschrift Itineraires d'Orient: Hommages a Claude Cahen, edited by Raoul Curiel and Rika Gyselen, appeared in 1995 as an honor to his "distinguished career", and an issue of the journal Arabica (43/1 (1996)) was dedicated to him.
That issue also includes a nearly complete bibliography of his works.