Terry Allen may refer to:

• Terry Allen (singer), Country singer and artist.
• Terry Allen (wrestler), Professional wrestler known as Magnum T.A.
• Terry Allen (boxer), Professional boxer.
• Terry Allen (football coach), former head football coach of the University of Kansas and current head coach at Missouri State University.
• Terry Allen (football player), former running back for the Washington Redskins
• Terry de la Mesa Allen (Major General), Commanding General of the U.S. 1st Infantry Division and then the U.S. 104th Infantry Division during World War II.
• Terry de la Mesa Allen, Jr., commander of 2nd Battalion, 28th Infantry Regiment, U.S. 1st Infantry Division, son of Major General Terry de la Mesa Allen; killed in action in Vietnam October 17, 1967.