The Fly is a 1958 American science fiction horror film and the first installment in The Fly film series. The film was produced and directed by Kurt Neumann and stars David Hedison, Patricia Owens, Vincent Price, and Herbert Marshall. The screenplay by James Clavell is 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 human–fly hybrid after a common house fly enters unseen into a molecular transporter with which he is experimenting, resulting in his atoms being combined with those of the insect. The film was released in CinemaScope by 20th Century Fox, with color by Deluxe. It was followed by two black-and-white sequels, Return of the Fly (1959) and Curse of the Fly (1965). A remake directed by David Cronenberg was released in 1986.

It was released in 1958 as a double feature with Space Master X-7.