Denis Greenhill, Baron Greenhill of Harrow
Denis Arthur Greenhill, Baron Greenhill of Harrow, GCMG OBE (7 November 1913 – 8 November 2000) was a senior British diplomat and civil servant who led Britain's Foreign Service from 1969 to 1973.
He helped shape a new direction for Britain's role in the world after World War II, moving away from imperial ties and a close alignment with the United States toward stronger engagement with Europe. He served under three prime ministers: Harold Wilson, Alec Douglas-Home, and Edward Heath.
Greenhill was educated at Bishop’s Stortford College and Christ Church, Oxford. He worked for the London and North Eastern Railway from 1935 to 1939. During World War II he served in the Middle East, Far East, India and North Africa, reaching the rank of colonel in the Royal Engineers and was mentioned in dispatches twice. He married Angela McCulloch in Cairo in 1941; she died in 2013.
He joined the Foreign Office in 1946, with support from Ernest Bevin, who valued him as an expert on oil transport. He later served as counsellor and then minister at the British Embassy in Washington, notably during the Cuban Missile Crisis (1962) and the assassination of US President John F. Kennedy (1963).
As Britain’s special envoy to Rhodesia in 1972 and 1976, he tried, unsuccessfully, to end Rhodesia’s Unilateral Declaration of Independence. He became Permanent Under-Secretary of State for Foreign Affairs in 1969, the top civil servant in the Foreign Office, and oversaw Britain’s entry into the European Communities in 1973.
Greenhill was created a life peer in 1974, sitting as a crossbencher. He later held roles such as governor of the BBC and director at several major companies including BAT Industries, Hawker Siddeley, Wellcome Foundation, Clerical Medical and General Life Assurance, S.G. Warburg, and Leyland International.
His career is also remembered for controversy: as head of the Colonial Office he supported the forced deportation of Chagos Islanders from the British Indian Ocean Territory, describing some of the islanders in dehumanizing terms.
His honours included the OBE in 1942, CMG in 1960, KCMG in 1967, and GCMG in 1972.
This page was last edited on 3 February 2026, at 18:06 (CET).