99		The Giant Behemoth (Drama, Fantasy, Horror, 1959)
95		Gorgo (Action, Drama, Horror, 1961)
86		Godzilla, King of the Monsters! (Action, Horror, Sci-Fi, 1956)
83		Reptilicus (Action, Horror, Sci-Fi, 1961)
72		Them! (Horror, Sci-Fi, 1954)
71		The Thing from Another World (Horror, Sci-Fi, 1951)
70		The Deadly Mantis (Horror, Sci-Fi, Thriller, 1957)
65		Attack of the Crab Monsters (Horror, Sci-Fi, 1957)
62		I Am Legend (Drama, Horror, Sci-Fi, 2007)
62		Species II (Action, Horror, Sci-Fi, 1998)
57		Anacondas: The Hunt for the Blood Orchid (Action, Adventure, Horror, 2004)
57		Five Million Years to Earth (Horror, Mystery, Sci-Fi, 1967)
57		Godzilla 1985 (Action, Horror, Sci-Fi, 1984)
57		Godzilla vs. Destoroyah (Action, Horror, Sci-Fi, 1995)
53		King Kong (Adventure, Fantasy, Horror, 1933)
53		Curse of the Faceless Man (Adventure, Horror, Sci-Fi, 1958)
52		The Creeping Flesh (Horror, Sci-Fi, 1973)
52		The Last Man on Earth (Horror, Sci-Fi, 1964)
52		The Descent (Adventure, Horror, Thriller, 2005)
52		The Thing (Horror, Mystery, Sci-Fi, 2011)
52		Nightmare City (Action, Horror, Sci-Fi, 1980)
52		Horror Express (Horror, Sci-Fi, 1972)
50		Primeval (Action, Adventure, Crime, Horror, 2007)
50		The Twilight People (Adventure, Horror, Sci-Fi, 1972)
50		Mad Doctor of Blood Island (Adventure, Horror, Sci-Fi, 1968)
50		The Curse of Frankenstein (Horror, Sci-Fi, 1957)
50		It! The Terror from Beyond Space (Horror, Sci-Fi, 1958)
49		Q (Crime, Horror, Mystery, 1982)
48		Varan the Unbelievable (Horror, Sci-Fi, 1962)
47		The Descent: Part 2 (Adventure, Horror, Thriller, 2009)
47		Prophecy (Sci-Fi, Horror, 1979)
47		The Cave (Adventure, Horror, Thriller, 2005)
47		The Mist (Horror, Sci-Fi, 2007)
47		Quarantine (Horror, Sci-Fi, Thriller, 2008)
47		Island Claws (Horror, Sci-Fi, 1980)
47		Equinox (Horror, Adventure, Mystery, 1970)
45		The Blob (Horror, Sci-Fi, 1958)
44		The Manster (Horror, Sci-Fi, 1959)
44		The Monster of Piedras Blancas (Horror, Sci-Fi, 1959)
43		Hand of Death (Horror, Sci-Fi, 1962)
43		The Abominable Snowman (Adventure, Horror, Sci-Fi, 1957)
42		Giant from the Unknown (Drama, Horror, 1958)
42		The Crazies (Action, Horror, Sci-Fi, 1973)
42		Resident Evil: Apocalypse (Action, Horror, Sci-Fi, 2004)
42		The Return of Doctor X (Horror, Mystery, Sci-Fi, 1939)
42		Wonderland (Fantasy, Horror, Sci-Fi, 2011)
42		2019: After the Fall of New York (Action, Horror, Sci-Fi, 1983)
42		Spring (Horror, Romance, Sci-Fi, 2014)
42		Ticks (Horror, Sci-Fi, 1993)
42		Metamorphosis: The Alien Factor (Horror, Sci-Fi, 1990)
42		Alien: Resurrection (Action, Horror, Sci-Fi, 1997)
42		Man Made Monster (Drama, Horror, Sci-Fi, 1941)
42		The Deadly Spawn (Horror, Sci-Fi, 1983)
41		It Came from Beneath the Sea (Horror, Sci-Fi, 1955)
40		Attack of the 50 Foot Woman (Horror, Sci-Fi, 1958)
40		Enemy from Space (Sci-Fi, Horror, 1957)
40		The Colossus of New York (Horror, Sci-Fi, 1958)
40		How to Make a Monster (Horror, Sci-Fi, 1958)
40		Frankenstein 1970 (Horror, Sci-Fi, 1958)
40		Fiend Without a Face (Horror, Sci-Fi, 1958)
40		Segon origen (Adventure, Horror, Sci-Fi, 2015)
40		The Mask of Fu Manchu (Adventure, Horror, Sci-Fi, 1932)
40		The Vampire (Horror, Sci-Fi, Thriller, 1957)
40		The Unknown Terror (Horror, Sci-Fi, 1957)
40		Creatures the World Forgot (Adventure, Horror, Sci-Fi, 1971)
40		The Food of the Gods (Adventure, Horror, Sci-Fi, 1976)
40		The Monster That Challenged the World (Horror, Sci-Fi, 1957)
39		Jeepers Creepers (Horror, Mystery, 2001)
39		Godzilla vs. Biollante (Action, Drama, Horror, 1989)
38		House of Frankenstein (Fantasy, Horror, Sci-Fi, 1944)
38		House of Dracula (Fantasy, Horror, Sci-Fi, 1945)
38		Frankenstein (Drama, Horror, Sci-Fi, 1931)
37		Monkey Shines (Drama, Horror, Sci-Fi, 1988)
37		C.H.U.D. (Horror, Sci-Fi, 1984)
37		Queen of Blood (Horror, Sci-Fi, 1966)
37		The Demon's Rook (Adventure, Fantasy, Horror, 2013)
37		Throwback (Action, Adventure, Horror, 2014)
37		Beast of Blood (Adventure, Horror, 1970)
37		Daybreakers (Action, Horror, Sci-Fi, 2009)
37		Willard (Horror, Sci-Fi, 1971)
37		Swamp Thing (Horror, Sci-Fi, 1982)
37		Man-Thing (Action, Adventure, Horror, 2005)
37		The Kindred (Horror, Sci-Fi, Thriller, 1987)
37		Night Shadows (Horror, Sci-Fi, Thriller, 1984)
37		Thirst (Horror, Romance, Sci-Fi, 1979)
37		Isolation (Horror, Sci-Fi, Thriller, 2005)
37		Rabid (Horror, Sci-Fi, 1977)
37		Beyond Atlantis (Fantasy, Horror, Sci-Fi, 1973)
36		The Flying Serpent (Horror, 1946)
36		The Beast of Hollow Mountain (Horror, Romance, Sci-Fi, 1956)
35		Dracula Untold (Action, Drama, Fantasy, Horror, 2014)
35		Not of This Earth (Horror, Sci-Fi, 1957)
34		Supernatural (Horror, Mystery, Thriller, 1933)
34		Cat People (Fantasy, Horror, Thriller, 1942)
34		Island of Terror (Horror, 1966)
34		The Living Dead Girl (Horror, 1982)
34		Humongous (Horror, Romance, 1982)
34		The Howling (Horror, 1981)
34		Midnight Son (Horror, 2011)
34		Dark Water (Drama, Horror, Thriller, 2005)
34		The Fog (Fantasy, Horror, 1980)
34		Mystery of the Wax Museum (Horror, Mystery, Thriller, 1933)
34		Hellraiser III: Hell on Earth (Horror, 1992)
34		Hellraiser (Fantasy, Horror, 1987)
34		The Town That Dreaded Sundown (Crime, Drama, Horror, 1976)
34		Barracuda (Horror, Thriller, 1978)
34		Trick 'r Treat (Horror, Thriller, 2007)
33		The Day of the Triffids (Horror, Sci-Fi, 1962)
32		The Arrival (Horror, Sci-Fi, 1991)
32		Donovan's Brain (Sci-Fi, Horror, 1953)
32		Blood Beast from Outer Space (Horror, Sci-Fi, 1965)
32		The Terror Within (Horror, Sci-Fi, 1989)
32		Death Street USA (Action, Sci-Fi, Horror, 1988)
32		Die, Monster, Die! (Mystery, Horror, Sci-Fi, 1965)
32		Blood of the Beast (Horror, Sci-Fi, 2003)
32		Scourge (Horror, Mystery, Sci-Fi, 2008)
32		Target Earth (Horror, Sci-Fi, 1954)
32		The Maze (Horror, Sci-Fi, 1953)
32		Creature from the Black Lagoon (Horror, Sci-Fi, 1954)
32		Rejuvenatrix (Horror, Sci-Fi, 1988)
32		Demonwarp (Horror, Mystery, Sci-Fi, 1988)
32		Phantom from Space (Horror, Sci-Fi, 1953)
32		Slime City Massacre (Action, Horror, Sci-Fi, 2010)
32		Chrysalis (Drama, Horror, Sci-Fi, 2014)
32		The Dark (Horror, Sci-Fi, 1979)
32		The Man with Two Heads (Horror, Sci-Fi, 1972)
32		It Came from Outer Space (Horror, Sci-Fi, 1953)
32		Frankenstein Meets the Wolf Man (Fantasy, Horror, Sci-Fi, 1943)
32		The Alien Factor (Horror, Sci-Fi, 1978)
32		The Terror Within II (Horror, Sci-Fi, 1991)
32		Invasion of the Body Snatchers (Horror, Sci-Fi, 1956)
32		Syngenor (Horror, Sci-Fi, 1990)
32		The Neanderthal Man (Horror, Sci-Fi, 1953)
31		This Island Earth (Horror, Mystery, Sci-Fi, 1955)
31		Revenge of the Creature (Horror, Sci-Fi, 1955)
31		The Man from Planet X (Horror, Romance, Sci-Fi, 1951)
31		Five (Drama, Horror, Sci-Fi, 1951)
31		Vampire Hunter D: Bloodlust (Animation, Action, Adventure, Horror, 2000)
31		Bride of the Monster (Horror, Sci-Fi, 1955)
31		The Quatermass Xperiment (Horror, Sci-Fi, 1955)
31		It Conquered the World (Horror, Sci-Fi, Thriller, 1956)
31		Horrors of the Black Museum (Horror, 1959)
31		The Incredible Shrinking Man (Drama, Horror, Sci-Fi, 1957)
31		The Black Sleep (Horror, Sci-Fi, 1956)
31		Tarantula (Horror, Sci-Fi, 1955)
31		Day the World Ended (Horror, Sci-Fi, 1955)
31		The Mole People (Adventure, Fantasy, Horror, 1956)
31		The Gamma People (Drama, Horror, Sci-Fi, 1956)
31		Creature with the Atom Brain (Crime, Horror, Sci-Fi, 1955)
31		The Werewolf (Sci-Fi, Horror, 1956)
31		X the Unknown (Horror, Sci-Fi, 1956)
31		Beast from Haunted Cave (Crime, Horror, Thriller, 1959)
30		Unknown Island (Adventure, Horror, Romance, 1948)
30		Attack of the Puppet People (Sci-Fi, Horror, 1958)
30		The Cosmic Monster (Drama, Sci-Fi, Horror, 1958)
30		Interview with the Vampire: The Vampire Chronicles (Drama, Fantasy, Horror, 1994)
30		Thou Shalt Not Kill... Except (Action, Thriller, Adventure, Horror, 1985)
30		She Demons (Horror, Sci-Fi, 1958)
30		The Woman Eater (Horror, Sci-Fi, 1958)
30		The Spider (Horror, Sci-Fi, 1958)
30		Space Master X-7 (Horror, Sci-Fi, Thriller, 1958)
30		War of the Satellites (Horror, Sci-Fi, 1958)
30		She Devil (Horror, Sci-Fi, 1957)
30		Blood of the Vampire (Horror, Sci-Fi, 1958)
30		Monster on the Campus (Horror, Sci-Fi, 1958)
30		The Sword and the Sorcerer (Action, Adventure, Fantasy, Horror, 1982)
30		The Cyclops (Horror, Sci-Fi, 1957)
30		The Giant Claw (Fantasy, Horror, Sci-Fi, 1957)
30		The Man Who Turned to Stone (Horror, Sci-Fi, 1957)
30		The Man Without a Body (Horror, Sci-Fi, 1957)
30		20 Million Miles to Earth (Fantasy, Horror, Sci-Fi, 1957)
30		The Brain Eaters (Sci-Fi, Horror, 1958)
30		The Brain from Planet Arous (Action, Adventure, Horror, 1957)
30		Nosferatu the Vampyre (Drama, Fantasy, Horror, 1979)
30		The Monolith Monsters (Drama, Horror, Sci-Fi, 1957)
30		Beowulf (Action, Adventure, Fantasy, Horror, 1999)
30		I Was a Teenage Frankenstein (Horror, Sci-Fi, 1957)
30		The Crawling Eye (Horror, Sci-Fi, 1958)
30		The Black Scorpion (Horror, Sci-Fi, 1957)
30		I Married a Monster from Outer Space (Horror, Sci-Fi, 1958)
29		The Hunger (Horror, 1983)
29		Martin (Drama, Horror, 1977)
29		Stay Alive (Horror, Thriller, 2006)
29		Friday the 13th Part 2 (Horror, Mystery, Thriller, 1981)
29		The Thing (Horror, Mystery, Sci-Fi, 1982)
29		Wendigo (Horror, Mystery, Thriller, 2001)
29		Cat People (Fantasy, Horror, Thriller, 1982)
29		Rocktober Blood (Horror, Music, 1984)
29		Scary or Die (Horror, 2012)
29		Lighthouse (Horror, Thriller, 1999)
29		The Ghouls (Horror, 2003)
29		End of Days (Action, Fantasy, Horror, 1999)
29		StageFright (Horror, 1987)
29		Inferno (Horror, Mystery, 1980)
29		Nightwing (Horror, 1979)
29		Maniac (Drama, Horror, Thriller, 1980)
29		House of 1000 Corpses (Horror, 2003)
29		Afflicted (Horror, Mystery, Thriller, 2013)
29		Salvage (Horror, Mystery, Thriller, 2006)
29		Alien (Horror, Sci-Fi, 1979)
29		Grace (Drama, Horror, Thriller, 2009)
29		Plan 9 from Outer Space (Horror, Sci-Fi, 1959)
29		The Addiction (Horror, 1995)
29		Village of the Damned (Horror, Sci-Fi, 1960)
29		The Alligator People (Horror, Sci-Fi, 1959)
29		The Man Who Could Cheat Death (Drama, Horror, Sci-Fi, 1959)
29		The Leech Woman (Horror, Romance, Sci-Fi, 1960)
29		Thirst (Fantasy, Horror, 2009)
29		Terror Is a Man (Horror, Romance, Sci-Fi, 1959)
29		The Wasp Woman (Horror, Sci-Fi, 1959)
29		4D Man (Sci-Fi, Horror, Romance, 1959)
29		The Mummy (Adventure, Fantasy, Horror, 1959)
29		Invisible Invaders (Sci-Fi, Horror, 1959)
29		Drive-In Horrorshow (Horror, 2009)
29		The Wolfman (Drama, Fantasy, Horror, 2010)
29		Prowl (Horror, 2010)
29		The Evil of Frankenstein (Horror, 1964)
29		Mirrors (Horror, Mystery, 2008)
29		First Man Into Space (Drama, Horror, Sci-Fi, 1959)
29		The Church (Horror, 1989)
29		Wolf (Drama, Horror, Romance, 1994)
29		The Hands of Orlac (Crime, Horror, Sci-Fi, 1960)

Notes: Movies similar to The Beast from 20,000 Fathoms, Movies like The Beast from 20,000 Fathoms, Adventure, Horror, Sci-Fi, Eugène Lourié, Paul Hubschmid, Paula Raymond, Cecil Kellaway, Kenneth Tobey, Films, Video, Movie Similarities