Prey (known as Alien Prey in some markets) is a 1977 British science fiction horror film produced by Terry Marcel and directed by Norman J. Warren. The plot concerns a carnivorous alien (Barry Stokes) landing on Earth and befriending a lesbian couple (Glory Annen and Sally Faulkner) as part of his mission to evaluate humans as a source of food. It was filmed in under two weeks on a budget of less than £60,000 (approximately £396,600 in 2021) using locations near Shepperton Studios in Surrey. It had a limited distribution on release.

Critical response to the film has been mixed: verdicts range from "odd", "bizarre" or "eccentric" to "ambitious" and "experimental", while the film's "claustrophobic" atmosphere has drawn both praise and criticism. Prey has also attracted commentary for its presentation of conflicting male and female sexuality, with some critics observing similarities to the plot of D.H. Lawrence's 1922 novella The Fox. It has been compared to a vampire or zombie film and has also been cited as an example of the exploitation (or sexploitation) genre. Plans for a sequel, Human Prey, were abandoned.