John Keith Vernon was a Canadian actor. He made a career in Hollywood after achieving initial television stardom in Canada. He was best known for playing Dean Wormer in Animal House, the Mayor in Dirty Harry and Fletcher in The Outlaw Josey Wales.

National Lampoon's Animal House is a 1978 American comedy film directed by John Landis and written by Harold Ramis, Douglas Kenney and Chris Miller. It stars John Belushi, Tim Matheson, John Vernon, Verna Bloom, Thomas Hulce and Donald Sutherland. The film is about a trouble-making fraternity whose members challenge the authority of the dean of the fictional Faber College.