It's Alive is a 1974 American science fiction horror film written, produced, and directed by Larry Cohen. It stars John P. Ryan and Sharon Farrell as a couple whose infant child turns out to be a vicious mutant. The film's cast also includes James Dixon, William Wellman Jr., Shamus Locke, Andrew Duggan, Guy Stockwell, and Michael Ansara. The baby was designed and created by special effects make-up artist Rick Baker, and the film's score was composed by Bernard Herrmann.

It's Alive was distributed by Warner Bros. and received mixed reviews upon release. It spawned two sequels, It Lives Again (1978) and It's Alive III: Island of the Alive (1987), as well as a 2009 remake. It is the only film in the It's Alive series with a PG rating as the remainder of the series all have the R rating.