Edward Hallett Carr (1892–1982) was a British historian and international relations theorist.

He was educated at the Merchant Taylors' School in London, and Trinity College, Cambridge. He joined the British Foreign and Commonwealth Office (diplomatic service) in 1916, resigning in 1936. He became the Wilson Professor of International Politics at the University of Wales Aberystwyth, and is particularly known for his contribution on International Relations theory. His famous work, Twenty Years Crisis was published in 1939. He later served as assistant editor of The Times from 1941 to 1946.

Carr's writings include biographies of Feodor Dostoyevsky (1931), Karl Marx (1934), and Mikhail Bakunin (1937), as well as important studies on international relations and on the Soviet Union. Other major works include History of Soviet Russia (9 vol., 1950–71) and What is History? (1961).