- "Them"
- .GIFfany
- 10,000 Volt Ghost
- 8-Eyed Bat
- 8 Ball
- A. K. Fortesan
- A. L.
- ARTT
- Aang
- Aardvark (Ice Age)
- Aarghaumont
- Aaron Helzinger
- Aaron Scates
- Aaron Thorne
- Aathea
- Abada
- Abaddon (Supernatural)
- Abartige Aasfresser
- Abath (Grimm)
- Abbey Bominable
- Abby (Agents of S.H.I.E.L.D.)
- Abby (Let Me In)
- Abigail
- Abnormal Child
- Abnormality
- Aboleth
- Abomasnow
- Abominable Snow Mollusk
- Abomination (Fallout)
- Abomination (Teen Titans)
- Abominite
- Abominom
- Abracadaniel's Species
- Abracadaver
- Abradolf Lincler
- Abraham Van Brunt
- Abraxas
- Abraxas (Face Off)
- Absol
- Abstract Daddy
- Abyss Dweller
- Abyss Wyrm
- Abyssal
- Accelgor
- Acceraptor
- Acererak
- Achatina limusegnis
- Ache
- Acheman
- Acid (Chrono Trigger)
- Acid Breath
- Acid Grub
- Ackpow
- Acro
- Acro-Bandit
- Acromantula
- Aculeozzo
- Adam's Dragon Bridge Troll
- Adam (Abraham Lincoln: Vampire Hunter)
- Adam Fells
- Adam Heller
- Adam Jacobs
- Adam Milicevic (Face Off)
- Adamantoise
- Adaro
- Adelaide (Over the Garden Wall)
- Adella
- Adjule
- Adjule (Resident Evil)
- Admirabilis
- Adolf Hitler (Nazis at the Center of the Earth)
- Adolfo's Spider/Human Hybrid
- Adolfo's Subterranean Creature
- Adolfo's Vampire
- Aechmea/Human Hybrid
- Aecyto Weevil
- Aecytonyx
- Aecytosaur
- Aegislash
- Aeon (Rudolph's Shiny New Year)
- Aeralfos
- Aerodactyl
- Aeshma
- Afanc
- Afanc (Dungeons & Dragons)
- Afnor
- African Werewolf
- Afterburn
- Agaddon Hunter
- Agatha Gillman
- Agathion (Dungeons & Dragons)
- Aggressiveness Level
- Aggron
- Agnes Bragga
- Agogwe
- Agropelter
- Aguav Berry
- Agumon
- Agunimon
- Ahool
- Ahriman (Final Fantasy)
- Ahuizotl
- Ai
- Aidan (Heroes of Might and Magic IV)
- Aidan Waite
- Ailuranthrope
- Ainu
- Air-snake
- Air Cannon
- Air Elemental (Face Off)
- Air Screamer
- Airchopper
- Airswitch
- Aisling
- Aisling's Mother
- Ajax Petropolus
- Ajed Al-Gebraic
- Ajwar
- Ak-Moho-Alii
- Akaname
- Akantor
- Akapura
- Akasha
- Akatsuki Kain
- Akharin
- Akihide Karatsu
- Akihiro
- Akira Kimura
- Akka
- Akkorokamui
- Aku (Samurai Jack)
- Al-Kaseem Firecracker Beetle
- Al-mi'raj
- Al Muddy
- Aladdin (Magi)
- Alakazam
- Alam and Eric Z's Giant
- Alan Evercroft
- Alan Hammond
- Alan Scott
- Alana
- Alana's Subterranean Creature
- Alaskan Bull Worm
- Alaskan Monster
- Alaskan Tiger
- Alastair (Supernatural)
- Albatoss
- Albert Michaels
- Albert Rothstein
- Albert Tanner
- Alberto Scorfano
- Albino Baboon
- Albino Deepwater Bull Shark
- Albino Humping Worm
- Albino Penguin
- Alcremie
- Aldrich Leviathan
- Alebrije
- Alebrije (Coco)
- Alec (Twilight)
- Alec Holland
- Aleera
- Alert Spider
- Alex Mercer
- Alex Murphy
- Alex Power
- Alex Summers
- Alexander (Fullmetal Alchemist)
- Alexander Anderson
- Alexander Nikolaevich Hell
- Alfirin
- Alfrid Lickspittle
- Alfur
- Algae Man
- Alim Coelacanth
- Alina
- Alison Blaire
- Alistair (Twilight)
- Alkali (Chrono Trigger)
- Alkali Lake Monster
- Allamistakeo
- Allegewi
- Allegewi (The Secret Saturdays)
- Allen Leighton
- Allidillo
- Allie Tannenbaum (Face Off)
- Allosaurus (Jurassic Park)
- Allosaurus (The Land Before Time)
- Allosaurus therotribus
- Alma (Snakes on a Train)
- Almas
- Alomomola
- Aloysius Animo
- Alp
- Alpe
- Alphabat
- Alpine Dragon
- Alriune
- Altamaha-ha
- Altaria
- Altrusian
- Alu-demon
- Alucard
- Alucard (Castlevania)
- Alucard (Hellsing)
- Alura Une
- Alurtle
- Alveus
- Alyssa (Marvel Comics)
- Amabie
- Amahl Farouk
- Amakagame
- Amalgam (Breath of Fire III)
- Amalthea
- Amao
- Amara Aquilla
- Amarillo Lestoat
- Amarok
- Amarok (Grimm)
- Amarok (The Secret Saturdays)
- Ambipom
- Ambrosial Amberjack
- Ame-no-Uzume-no-Mikoto
- Amelia (Underworld)
- American Mapinguari
- American Olitiau
- Amilyn (Buffy the Vampire Slayer)
- Amma
- Ammit (Face Off)
- Amoonguss
- Amorpho
- Amorphous Shape
- Amp (Generator Rex)
- Ampharos
- Amphibian
- Amphibian (Disney)
- Amphibian (Sentōru no Nayami)
- Amphibian (Voyage to the Bottom of the Sea)
- Amphibian Man
- Amphibious Creature
- Amphibious Humanoid
- Amphibious Oyster
- Amphibius
- Ampilus
- Amy Rose
- Amy Zahn
- Anaerobic Lifeform (The Green Marauder)
- Anahir
- Anathema Device
- Ancestor
- Anchorwhip
- AncientMegatheriummon
- Ancient Enemy
- Ancient Fairy Warrior
- Ancient Fish (The Legend of Zelda)
- Ancient Katydid
- Ancient One
- Andean Wolf
- Andrew (Gone)
- Andrew Detmer
- Andrew Garner
- Andrew Martin
- Andria (Heroes of Might and Magic IV)
- Andrina
- André Delambre
- Andréas Obry
- Aneh-Tet
- Aneru
- Angel
- Angel (Supernatural)
- Angel Salvadore
- Angel of Death (Hellboy)
- Angel of the Odd
- Angelfish/Human Hybrid
- Angelina
- Angelique
- Angemon
- Angewomon
- Anggitay
- Angler (ARK)
- Angler (Pirates of the Caribbean)
- Angler Heron
- Angor Rot
- Angoramon
- Angry Molesting Tree
- Anguirus
- Angus (Lost in Space)
- Angus Bumby
- Angus McDonough
- Animation Dragon
- Animatronic (Willy's Wonderland)
- Anime Candy Princess
- Anissa Pierce
- Aniwye
- Ankheg
- Ankylosaurus (Jurassic Park)
- Ankylosaurus (The Lost World)
- Ankylosaurus crassacutis
- Anna Franklin
- Anna Manananggirl
- Anne Lokensgard
- Annetta Fish
- Annihilape
- Annis
- Anson Minor
- Ant/Human Hybrid
- Ant (City)
- Ant (Empire of the Ants)
- Ant Bear
- Ant Lion (Dungeons & Dragons)
- Antarctic Cryptid
- Antarctic Godzilla
- Antarctican (Sentōru no Nayami)
- Antedeluvian
- Anteka
- Anthony (Marvel Comics)
- Anthony Haden-Scott
- Anthony Stark (Paradise X Heralds)
- Anthony and Autumn's Giant
- Anthraxus
- Anti-Being
- Anti-Fairy
- Antlion (American McGee's Alice)
- Anton Zeck
- Antonin Dolohov
- Antonio (Teenage Mutant Ninja Turtles)
- Antonio Rodriguez
- Anubis
- Anubis (Face Off)
- Anubis (Grimm)
- Anubis (Sands of Oblivion)
- Anubis (Supernatural)
- Anubis (The Pyramid)
- Anubis Warrior (The Mummy Returns)
- Anung Un Rama
- Anya Corazon
- Aosagihoni
- Apatosaurus (Jurassic Park)
- Apatosaurus (The Land Before Time)
- Apatostegosaurus
- Apceros
- Ape-Man
- Ape-Man (Primal)
- Ape (Final Fantasy Adventure)
- Ape (Planet of the Apes)
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