Aeneas MacKenzie, or Æneas MacKenzie, (August 15, 1889, Stornoway, Scotland – June 2, 1962, Los Angeles) was a Scottish-American screenwriter. MacKenzie wrote many notable Hollywood films, including: The Private Lives of Elizabeth and Essex (1939), They Died with Their Boots On (1941), Ivanhoe (1952), and The Ten Commandments (1956).