Sir Ewen Alastair John Fergusson GCMG GCVO (born 28 October 1932) is a retired British diplomat.
The son of Sir Ewen MacGregor Field Fergusson and Winifred Evelyn Fergusson, he was educated at Rugby and Oriel College, Oxford. He played rugby for Oxford University and for Scotland, gaining 5 caps. While at Oxford he was a member of The Bullingdon Club, a notorious dining club 'infamous for riotous behaviour',[citation needed] whose subsequent members included Boris Johnson and David Cameron.
After 2 years with the King's Royal Rifle Corps, he entered Her Majesty's Diplomatic Service in 1956.
He was British Ambassador to South Africa 1982-84, deputy under secretary of state at the Foreign and Commonwealth Office 1984-87 and British Ambassador to France 1987-92.
He was Chairman of Coutts from 1993–99, and of the Savoy Hotel Group 1994-98. He was Chairman of the governors of Rugby School from 1995–2002 and a trustee of the National Gallery from 1995-2002.
He is an honorary fellow of Oriel College, Oxford and holds an honorary LLD from Aberdeen University. He was appointed KCMG in 1987, GCVO in 1992, GCMG in 1993, and a Grand Officier of the Légion d'Honneur. He served as King of Arms of the Order of St Michael and St George from 1996 until 2007.