Jeffrey Duncan Jones is an American actor, known for his roles as Emperor Joseph II in Amadeus, Edward R. Rooney in Ferris Bueller's Day Off, Charles Deetz in Beetlejuice,  Dr. Skip Tyler in The Hunt for Red October, Eddie Barzoon in The Devil's Advocate, and A.W. Merrick in both Deadwood and Deadwood: The Movie.

His career started in Guthrie Theater in Minneapolis, and advanced to London and Broadway. In film and television, Jones has had many roles which capitalized on his deadpan portrayal of characters in unusual situations, often to comic effect. He was nominated for a Golden Globe Award for his performance in Amadeus and a Screen Actors Guild Award as part of the ensemble cast of Deadwood.