David Lemuel Keith (born May 8, 1954) is an American actor and director. His breakthrough role was that of aspiring Navy pilot Sid Worley in An Officer and a Gentleman (1982), for which he was nominated for two Golden Globe Awards. The positive reception for this role led to leading parts in the films The Lords of Discipline (1983), Firestarter (1984, based on the 1980 novel of the same name by Stephen King) and White of the Eye (1987). Keith had notable supporting roles in features including The Indian in the Cupboard (1995), U-571 (2000), Men of Honor (2000) and Daredevil (2003).

He played Major Jason Mercer in the revival series episode "Lithia".