One Million Years B.C. is a 1966 British adventure fantasy film directed by Don Chaffey. The film was produced by Hammer Film Productions and Seven Arts, and is a remake of the 1940 American fantasy film One Million B.C.. The film stars Raquel Welch and John Richardson, set in a fictional age of cavemen and dinosaurs existing together. Location scenes were filmed on the Canary Islands in the middle of winter, in late 1965. The UK release prints of this film were printed in dye transfer Technicolor. The U.S. version released by 20th Century Fox was cut by nine minutes, printed in DeLuxe Color, and released in 1967.

Like the original film, this remake is largely ahistorical. It portrays dinosaurs and humans living at the same point in time; according to the geological time scale, the last non-avian dinosaurs became extinct 66 million years ago, and modern humans (Homo sapiens) did not exist until about 300,000 years B.C. Ray Harryhausen, who animated all of the dinosaur attacks using stop-motion animation techniques, commented on the U.S. King Kong DVD that he did not make One Million Years B.C. for "professors...who probably don't go to see these kinds of movies anyway."