Frankenstein Conquers the World, (released in Japan as Frankenstein versus Subterranean Monster Baragon (フランケンシュタイン対地底怪獣バラゴン Furankenshutain Tai Chitei Kaijū Baragon?)) is a 1965 Kaiju film. A Japanese/American co-production, produced by Toho from Japan and Henry G. Saperstein's company UPA from America. Directed by Ishirō Honda and featuring special effects by Eiji Tsuburaya, the film starred Hollywood actor Nick Adams, alongside Japanese actors Tadao Takashima andKumi Mizuno.

This was the first of two Toho/UPA co-produced films featuring giant-sized Frankenstein monsters. A sequel called War of the Gargantuas was produced the following year.

The film was released theatrically in the United States in the Summer of 1966 by American International Pictures.