Gerald Sandford Graham (born 27 April 1903 in Sudbury, Ontario – died 5 July 1988 St Leonards-on-Sea, East Sussex) was Rhodes Professor of Imperial History at King's College London from 1949 until his retirement in 1970.
He earned a world reputation for his series of in-depth studies of the interrelationship between sea power and the development of the British empire.
While teaching there, Graham was able to get first-hand experience of the war at sea, by spending time during academic breaks on board Canadian destroyers in the Atlantic and in torpedo boats at Dover.
In 1967, Graham delivered the Reid Lectures at Acadia University, which were published as Tides of Empire: Discursions on the Expansion of Britain Overseas.
Immediately after Graham's retirement in London, he returned to Canada for two years as to serve as visiting professor of military and strategic studies at the University of Western Ontario in 1970–1972.