Sir Arthur Antony Duff (1920-2000) was a British civil servant and intelligence officer who served as Director General of MI5 from 1985-88. A submarine commander in the Second World War, Duff later joined the Foreign Office and served in Cairo, Paris, Bonn, and Kuala Lumpur. He was Ambassador to Nepal in 1964, and then High Commissioner in Kenya. From 1979-80, he was Deputy Governor to Lord Soames in Southern Rhodesia and played a crucial role in negotiations for Zimbabwe’s independence.