Alan Kenneth Mackenzie Clark (13 April 1928 – 5 September 1999) was a British Conservative Member of Parliament (MP), author and diarist. He served as a junior minister in Margaret Thatcher's governments at the Departments of Employment, Trade and Defence. He became a privy counsellor in 1991. He was the author of several books of military history, including his controversial work The Donkeys (1961), which inspired the musical satire Oh, What a Lovely War! Clark became known for his flamboyance, wit and irreverence.