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.

John Fitzgerald Kennedy, often referred to as JFK, was an American politician who served as the 35th president of the United States from 1961 until his assassination in 1963. He was the youngest person elected president. Kennedy served at the height of the Cold War, and the majority of his foreign policy concerned relations with the Soviet Union and Cuba. A Democrat, Kennedy represented Massachusetts in both houses of the United States Congress prior to his presidency.