Humphrey Trevelyan, Baron Trevelyan, KG, GCMG, CIE, OBE (27 November 1905 – 9 February 1985) was a British colonial administrator, diplomat and writer. Having begun his career in the Indian Civil Service and Indian Political Service, he transferred to HM Diplomatic Service upon Indian independence in 1947, and had a distinguished career during which he held several important ambassadorships.