The Fly is a 1958 American science fiction–horror film produced and directed by Kurt Neumann and starring David Hedison, Patricia Owens, Vincent Price and Herbert Marshall. The screenplay by James Clavell was based on the 1957 short story of the same name by George Langelaan.

The film tells the story of a scientist who is transformed into a grotesque creature after a common house fly enters unseen into a molecular transporter he is experimenting with, resulting in his atoms being combined with those of the insect, which produces a human-fly hybrid. The film was released in CinemaScope with Color by Deluxe by 20th Century Fox. It was followed by two black-and-white sequels, Return of the Fly (1959) and Curse of the Fly (1965). The original film was remade in 1986 by director David Cronenberg.