Beneath the Planet of the Apes is a 1970 American science fiction film directed by Ted Post from a screenplay by Paul Dehn, based on a story by Dehn and Mort Abrahams. The film is the sequel to Planet of the Apes (1968) and the second installment in the original Planet of the Apes film series. It stars James Franciscus, Kim Hunter, Maurice Evans, and Linda Harrison, and features Charlton Heston in a supporting role. In the film, a second spacecraft arrives on the planet ruled by apes, carrying astronaut Brent (Franciscus), who searches and finds Taylor (Heston) only to realize the apes are not their greatest threat.

Beneath the Planet of the Apes was released in the United States on May 26, 1970, by 20th Century-Fox. The film received mixed reviews from critics. It was followed by Escape from the Planet of the Apes in 1971.