PT 109 is a 1963 American Technicolor Panavision biographical war film depicting the actions of John F. Kennedy as an officer of the United States Navy in command of Motor Torpedo Boat PT-109 in the Pacific theater of World War II. The film was adapted by Vincent Flaherty and Howard Sheehan from the book PT 109: John F. Kennedy in World War II by Robert J. Donovan, and the screenplay was written by Richard L. Breen. Cliff Robertson stars as Kennedy, and the film features performances by Ty Hardin, James Gregory, Robert Culp and Grant Williams.

PT 109 was the first commercial theatrical film about a sitting U.S. president released while he was still in office (although FDR was often depicted in small roles during his administration, most notably in Yankee Doodle Dandy). It was released domestically on June 19, 1963, five months before Kennedy was assassinated in Dallas, Texas.