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