The Beast of Yucca Flats (released to television as Atomic Monster: The Beast of Yucca Flats) is a 1961 B-movie horror film written and directed by Coleman Francis. It was produced by Anthony Cardoza, Roland Morin and Jim Oliphant.

The film stars Swedish former wrestler Tor Johnson (in his last film role) as "the Beast". It stars Anthony Cardoza, Coleman Francis and Jim Oliphant in bit parts, as well as Conrad Brooks in a very small role. Director Francis cast his two sons (Ronald and Alan Francis) in the film as the two lost boys.

The plot concerns a Soviet scientist named Joseph Jaworsky (Tor Johnson), who defects and flees to a Nevada Test Site called Yucca Flats, only to be turned into a mindless monster by atomic radiation, stalking the desert. The film has very little dialogue and most of the speech is done by omniscient narration.