It Conquered the World is an independently made 1956 American science fiction film produced and directed by Roger Corman, and starring Peter Graves, Lee Van Cleef, Beverly Garland, and Sally Fraser. Shot in black-and-white, It Conquered the World was released theatrically by American International Pictures (AIP) as a double feature with The She-Creature.

It Conquered the World concerns an alien creature from the planet Venus that secretly wants to take control of the Earth. The creature makes radio contact with a disillusioned human scientist, who agrees to help because the scientist believes that such an alien intervention will bring peace and save a doomed humanity from itself.