- Apex
- Aphrodite
- Apicot Berry
- Apkallu
- Apkallu (Final Fantasy XI)
- Apollonir
- Appa
- Appear
- Apple
- Appletun
- Appmon
- Apricorn
- April Shepard
- Apsara
- Aptonoth
- Aqua
- Aquamentus
- Aquamorph
- Aquata
- Aquatic
- Aquilops (Jurassic Park)
- Aquus
- Aracha
- Arachnablade
- Arachnamech
- Arachni-Lobster
- Arachnid Species
- Arachno-claw
- Arachnopod
- Arachnoquake Spider
- Araneo
- Araquanid
- Aratuah
- Arbok (Pokémon)
- Arboliva
- Arborian
- Arborick
- Arcanadaemon
- Arcanine
- Arceus
- Archaic Lock
- Archangel Dragon
- Archelomon
- Archeops
- Archer (Small Soldiers)
- Archie (Monsters University)
- Archilus
- Arctovish
- Arctozolt
- Ares (Next Gen)
- Aretha
- Argentavis atrocollum
- Arges (Disney)
- Argonian
- Argosax
- Ariados
- Arica Monster
- Ariel (The Tempest)
- Ariscratle
- Arista
- Aristotle Adamo
- Arkadai
- Armachthys
- Armadillo (Sphinx and the Cursed Mummy)
- Armadillo Club
- Armadillo Experiment
- Armadillo Wolf
- Armadillomon
- Armadon
- Armagator
- Armaldo
- Armand Tesla
- Armando Muñoz
- Armillaria (Godzilla: The Series)
- Armored Beetle (Primal)
- Armos
- Armos Knight
- Army Ant (American McGee's Alice)
- Army Ant (Hasbro)
- Arnuki Beast
- Aro
- Aroma
- Aromatisse
- Arpagos
- Arroc
- Art3mis
- Arthropluera felsanguis
- Arthur Curry
- Arthur Douglas
- Artichoke/Human Hybrid
- Articuno
- Aruroda
- Asamad Van Ghoul
- Asanbosam
- Asato Ichijo
- Ascomoid
- Ash (Dawn of the Planet of the Apes)
- Ashen Ghoul
- Ashi
- Ashida Dragon
- Ashildr
- Ashley Barrett
- Ashwinder
- Asian Dragon
- Asian Lung Dragon
- Asmodeus (Equinox)
- Aspear Berry
- Asperdorsus bellator
- Aspidochelone
- Aspis
- Ass-Blaster
- Assassin Vine
- Asset
- Associated Federation of Crazy and Irresponsible Monsters
- Astaroth (Hero Wars)
- Astomos
- Astrid (Hilda)
- Astro Boy
- Asura (Soul Eater)
- Aswang
- Asëa Aranion
- Ataktos Fuse
- Atella
- Atercurisaurus
- Atlach-Nacha
- Atlantean
- Atlantic Sea King
- Atlee
- Atmospheric Beast
- Atmospheric Jellyfish (The Horror of the Heights)
- Atmospheric Predator
- Atomic Dog
- Atomic Shark
- Atomie
- Atrociraptor (Jurassic Park)
- Attack Frog
- Attila (Teenage Mutant Ninja Turtles)
- Attina
- Audino
- Augapfel-Aushacken
- Augurey
- Augustus Jones
- Auntie Whispers
- Aurorus
- Aurumvorax
- Austin Island Mutant
- Australian Werewolf
- Australotarsius
- Automaton (Alice: Madness Returns)
- Automaton (American McGee's Alice)
- Autumn's Beetle/Human Hybrid
- Ava (Ex Machina)
- Avalanche Fairy
- Avalanche Monster
- Avalonia
- Avalonian (Kid Stuff)
- Avalugg
- Avari
- Avarusaurus populator
- Aviana
- Awgwa
- Azarian
- Azazel (Marvel)
- Azazel (One Night of Song)
- Azdyryth
- Azelf
- Azer
- Azi Dahaka (Face Off)
- Azog
- Aztec Rex
- Azulongmon
- Azumarill
- Ba-dink-a-dink
- Baal
- Baal-seepa
- Baba
- Baba Yaga
- Babau (Dungeons & Dragons)
- Babawa
- Babeon
- Babiri Berry
- Babookari
- Baboonlizard
- Baby Button-Eyes
- Baby Doll
- Baby Dragon (The Christmas Dragon)
- Baby Legs
- Baby Oopsie Daisy
- Baby Troll
- Bacillus (Godzilla: The Series)
- Backslash
- Bacon Berry
- Bad-Luck Creature
- Bad Breath
- Badger E.V.O.
- Badgermole
- Bag Swordfish
- Bagi
- Bago-Bago
- Baihumon
- Bake-kujira
- Bakemon
- Bakene
- Bakeneko
- Baku
- Baku (Dungeons & Dragons)
- Bakunawa
- Balam
- Balduvian Bear
- Balduvian Hydra
- Balloon Boo
- Balloon Man
- Balm Mushroom
- Balrog
- Balsam
- Balthazar (Maleficent)
- Balthazar Edison
- Baluchimon
- Bamboon
- Bamm-Bamm Rubble
- Banana Bird
- Banana Fairy
- Bananaquat
- Bananostrich
- Band-Aid Nose Man
- Banderlog
- Bandersnatch
- Bandifish
- Bane (DC)
- Banette
- Banshee
- Banshee (Scream of the Banshee)
- Baphomet
- Baphomet (Dungeons & Dragons)
- Bar-Lgura
- Baragon
- Barbaracle
- Barbari-Ant
- Barbatus Ossifrage
- Bardelot
- Barghest
- Barghest (Dungeons & Dragons)
- Barghest (Hilda)
- Bariaur
- Barkburr
- Barmanu
- Barnacle Pirate
- Barnshe
- Barong
- Barraskewda
- Barry (Amphibia)
- Barry (Choo-Choo Charles)
- Barry Allen
- Bart-Looking Monster
- Bartell Bragga
- Bartholomew (Timon and Pumbaa)
- Bartholomew Boo
- Barugon
- Baryonyx (Jurassic Park)
- Baryonyx aquafulgur
- Basan
- Basculegion
- Basidirond
- Basil Karlo
- Basilisk
- Basilisk (Basilisk: The Serpent King)
- Basilisk (Game of Thrones)
- Basilisk (God of War)
- Basilisk (Harry Potter)
- Bast
- Basta
- Bastiodon
- Bat/Protea Hybrid
- Bat (Wolfenstein)
- Bat of Dol Guldur
- Batboy (K-fee)
- Batsquatch
- Batsquito
- Batteram
- Battra
- Batutut
- Bauk
- Baxter Stockman
- Baymax
- Bayohound
- Bayonet
- Beachplug
- Beamos
- Bear (Metro: Last Light)
- Bear Beast
- Bear Lake Monster
- Bear Owl
- Bear Pear
- Bearalope
- Bearealis
- Bearlion
- Bearmon
- Bearmoth
- Beartic
- Beast (Maggie the Ferocius Beast)
- Beast (Over the Garden Wall)
- Beast (The Lost Future)
- Beast Folk
- Beast from Haunted Cave
- Beast of Beckley
- Beast of Bladenboro
- Beast of Blue John Gap
- Beast of Bray Road
- Beast of Gévaudan
- Beastie
- Beastkin
- Beastmon
- Beatrice (Over the Garden Wall)
- Beatrice Rappaccini
- Beatrice Sharpe
- Beauregard
- Beautifly
- Beauty
- Beavecoon
- Beaver (After Man)
- Becklespinax (Jurassic Park)
- Bed Monster
- Bee/Human Hybrid
- Bee (The Babysitter)
- Beedrill
- Beefio
- Beelzeboss
- Beelzebufo palucocus
- Beelzemon
- Begoony
- Behemoth
- Behemoth (Behemoth)
- Behemoth (Danny Phantom)
- Behemoth (Dungeons & Dragons)
- Behemoth (Final Fantasy)
- Behemoth (Huntik)
- Behemoth (Megamind)
- Behemoth (MonsterVerse)
- Behemoth (Samurai Jack)
- Behemoth (The Mist)
- Behir
- Beholder (Dungeons & Dragons)
- Belial (Priest Manhwa)
- Bellossom
- Belue Berry
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