Castor Troy is the main antagonist of the 1997 sci-fi action-thriller film Face/Off.

He is a terrorist-for-hire who plans to stage a bombing in Los Angeles with the help of his brother Pollux, with a price tag of $10 million. However, his plans are hindered when his archenemy, FBI Deputy Director Sean Archer, knocks him into a coma and switches faces with him to thwart the bombing. As his original self, he was portrayed by Nicolas Cage, who also played Mr. Brent Ryan in Mom and Dad, Peter Loew in Vampire's Kiss, Yuri Orlov in Lord of War, Speckles in G-Force, Jacob Marley in the 2001 animated film adaptation of A Christmas Carol, and Little Junior Brown in Kiss of Death. While masquerading as Sean Archer, he was portrayed by John Travolta, who also portrayed Vic Deakins in Broken Arrow, Billy Nolan in Carrie, Howard Saint in The Punisher, Vincent Vega in Pulp Fiction, Ryder in The Taking of Pelham 123, Gabriel Shear in Swordfish, Emil Kovac in Killing Season and Terl in Battlefield Earth.