Charles Desmond Greaves (27 September 1913 – 23 August 1988) was an English Marxist activist and historian. He wrote a number of books on Irish history as a Marxist historian. A member of the Communist Party of Great Britain, through the Connolly Association he was one of the key figures, along with Roy Johnston, responsible for inserting Marxist perspectives into the 1960s Irish republicanism, in relation to the Northern Ireland civil rights movement.