William Denison McKinney was an American character actor. He played the sadistic mountain man in John Boorman's 1972 film Deliverance and appeared in seven Clint Eastwood films, most notably as Captain Terrill, the commander pursuing the last rebels to "hold out" against surrendering to the Union forces in The Outlaw Josey Wales.

Deliverance is a 1972 American thriller film produced and directed by John Boorman, and starring Jon Voight, Burt Reynolds, Ned Beatty, and Ronny Cox, with the latter two making their feature film debuts. The screenplay was adapted by James Dickey from his 1970 novel of the same name. The film was a critical and box office success, earning three Academy Award nominations and five Golden Globe Award nominations.