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 member of the Privy Council of the United Kingdom 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!