Thomas Lester Tryon was an American actor and novelist. As an actor, he was billed as Tom Tryon and is best known for playing the title role in the film The Cardinal (1963), featured roles in the war films The Longest Day (1962) and In Harm's Way (1965), acting with John Wayne in both movies, and especially the Walt Disney television character Texas John Slaughter (1958–1961). Tryon later turned to the writing of prose fiction and screenplays, and wrote several successful science fiction, horror and mystery novels as Thomas Tryon.

The Cardinal is a 1963 American drama film produced independently, directed by Otto Preminger and distributed by Columbia Pictures. The screenplay was written by Robert Dozier, based on the novel of the same name (1950) by Henry Morton Robinson. The music score was written by Jerome Moross.