Frederick Leonard Clark was an American film and television character actor, often cast in authoritative roles.

The Unsuspected is a 1947 American mystery film noir directed by Michael Curtiz and starring Claude Rains, Audrey Totter, Ted North, Constance Bennett, Joan Caulfield, and Hurd Hatfield. The film was based on the 1946 novel of the same title by Charlotte Armstrong. The screenplay was co-written by Bess Meredyth, who was married to director Curtiz.