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The Giant Behemoth is a 1959 British-American science fiction action horror film directed by Eugène Lourié, with special effects by Willis H. O'Brien, Pete Peterson, Irving Block, Jack Rabin, and Louis de Witt. The film stars Gene Evans and André Morell. The screenplay was written by blacklisted author Daniel Lewis James (under the name "Daniel Hyatt") with director Lourié.

Originally a story about an amorphous blob of radiation, the script was changed at the distributor's insistence to a style similar to The Beast from 20,000 Fathoms (1953), though elements of the original concept remain in the early parts of the film and in the "nuclear-breathing" power of the titular monster.

Scientist Steve Karnes delivers a speech to a British scientific society, led by Professor James Bickford, about the dangers to marine life posed by nuclear testing. Before Karnes can return to the United States, a real-life example of his concern materialises when a fisherman in Looe, Cornwall is killed on the beach, and his dying word is "behemoth". Later, thousands of dead fish are washed ashore.

Karnes and Bickford travel to Cornwall to investigate the fisherman's death and, although his injuries seem to include radiation burns, they find no evidence of radiation on the beach. Then, Karnes goes to inspect a passenger ship found wrecked and badly damaged, with the loss of all on board. Back in London, the two scientists discover that samples of the dead fish contain large amounts of radioactive contamination. Karnes begins to suspect that the "behemoth" that the fisherman described seeing is some kind of large marine animal that has mutated as a result of being contaminated by nuclear testing.

Paleosaurus (The Giant Behemoth) has not been a contender in any CBUB matches.