Sir John Albert Leigh Morgan (1929–2012) was a British diplomat who served as ambassador to South Korea, Poland and Mexico.
Morgan was born on 21 June 1929, the son of John Edward Roland Morgan, of Wylde Green, Warwickshire.
He served as First secretary of the Foreign Office. He was head of the Far Eastern Department, Foreign and Commonwealth Office (1970–1972); and head of Cultural Relations Department, Foreign and Commonwealth Office (1972–1980). His foreign postings included: third secretary to Moscow (1953–1956); at the unstable time of Stalin's death; second secretary to Peking (1956–1958); first secretary to Rio de Janeiro (1963–1964). His senior positions included first secretary and cultural attaché to Moscow (1965–1967); ambassador to South Korea (1980–1983), and ambassador to Poland (1983–1986) and ambassador to Mexico (1986–1989).
He was the son-in-law of Ann Fleming "née" Charteris (wife of "James Bond" author Ian Fleming); being married, on 26 July 1961, to The Hon. Fiona O'Neill (born 1936), only daughter of Charteris and her first husband Shane O'Neill, 3rd Baron O'Neill.