- "Robbin' Big" Jack Horner
- 8th Floor
- A.D.A.M.
- AM
- Aamon (Dark Prince)
- Aarfy
- Aaron (The Aristocrat's Otherworldly Adventure)
- Aaron Peel
- Aaron Spencer
- Abaddon (Supernatural)
- Abaddon the Despoiler
- Abalone Cookie
- Abdul-Aziz al-Razim
- Abigail Williams
- Abomination (2010 Marvel Animated Universe)
- Abomination (Peter David)
- Abominor
- Abraxas (Marvel)
- Absolute
- Absolute Hades God N Ma
- Absolute Solver
- Absolute Solver (N'raged)
- Abu Fayed
- Ace Killer
- Acheron
- Adam
- Adam (Abraham Lincoln: Vampire Hunter)
- Adam Grafton
- Adam Smasher
- Adam Sutler
- Adel Renard
- Admiral Atticus Noble
- Admiral Greyfield
- Admiral Razorbeard
- Adolf Hitler
- Adolf Hitler (Hunters)
- Adolf Hitler (The Twilight Zone)
- Adolf Hitler (Zombie Army)
- Adrian
- Adrian (Inside No. 9)
- Adrian Baker
- Adrian Lovell
- Adrian Yates
- Adult H
- Advisor (Dan the Man)
- Advisor (Marvel)
- Aegon IV Targaryen
- African Sorcerer
- Agatha Trunchbull
- Agent
- Agent 23
- Agent Gibbs
- Agent Information
- Agent Kruger
- Agent Trout
- Aggregor (Ben 10)
- Aggregor (The Final Key)
- Agustin Allende
- Ah Puch
- Ahab (Limbus Company)
- Ahk-Ton
- Ahmanet
- Ahmed
- Ai Magase
- Airachnid (Transformers: Prime)
- Airachnid (Transformers One)
- Ajax (X-Men Movies)
- Akasha (The Vampire Chronicles)
- Akihiro Kurata
- Akio Ohtori
- Akira Takaoka
- Akivasha
- Akrasiel
- Aku
- Akuro
- Alan
- Alan Jago
- Alan Sylvasta
- Alan Wilson
- Alan Yates
- Alaskan Bull Worm
- Alastair (Supernatural)
- Albert
- Albert Contiello
- Albert Spica
- Albert Wesker
- Alberta Saxby
- Alberto Fussar
- Aldrich
- Aldrich (Dark Souls)
- Aldrich Killian
- Alduin
- Alex
- Alex (Elephant)
- Alex Merritt
- Alex Windham
- Alexander Rausch
- Alexander Thorkel
- Alexei Luthor
- Alexia Ashford
- Alfie Blessington
- Algolian Volka
- Ali Al-Saachez
- Alice
- Alice (Tales of Halloween)
- Alicia Lohmeyer
- Alien
- Alien (The Hidden)
- Alien Adacic
- Alien Bat
- Alien Chibull Exceller
- Alien Empera
- Alien Ghose Leader
- Alien Nackle
- Alien Pedan
- Alien Reiblood
- Alien Spy Leader (The Fedora Chronicles)
- Alina Gray
- Alistair Pratt
- Almighty Tallests
- Alonzo Harris
- Aloyse von Roddenstein
- Aloysius Animo
- Alpha (Men In Black)
- Alphys (Negativetale)
- Alternate Salt & Pepper
- Alternate Timeline Benjamin Krupp
- Alternate Timeline Melvin Sneedly
- Alva
- Alvin the Treacherous
- Ambassador of Alagadda
- Ambush (GH'S)
- Amon (StarCraft)
- Amon Goeth
- Amshel Goldsmith
- Amy
- Amy Hughes
- Amy Kirio
- Anarky (Beware the Batman)
- Anatoly Cherdenko
- Anders Behring Breivik (22 July)
- Anders Benoit
- Andre Baptiste Jr.
- Andre Baptiste Sr.
- Andre Olivieri
- Andrei
- Andrei Sator
- Andrei Strasser
- Andrew Brandt
- Andrew Scott
- Andross
- Andy Evans
- Angel Eyes
- Angela Blanc
- Angelus
- Angra Mainyu
- Anjuro Katagiri
- Ankhsar Khatun
- Annihilus
- Ant-One
- Anthony "Tony" Damon
- Anthony Cooper
- Anthony Lamb
- Anthony Lilliman
- Anti-Monitor
- Anti-Monitor (Arrowverse)
- Anti-Monitor (DC)
- Anti-Monitor (Green Lantern: The Animated Series)
- Anti-Monitor (Scribblenauts)
- Antinous (EPIC: The Musical)
- Anton
- Anton Chigurh
- Anton Lone
- Antonio Tabacchi
- Antwan Hovachelik
- Anubis (Stargate SG1)
- Aparoid Queen
- Apartment Predator
- Ape Shaman
- Apep
- Apocalypse
- Apocalypse (Age of Apocalypse)
- Apocalypse (X-Men: The Animated Series)
- Apocalypse (X-Men Legends)
- Apocalypse (X-Men Movies)
- Apollogeist (A.R. World)
- Apple
- Ar-Pharazôn
- Arba
- Archbishop Augustine
- Archibald Cunningham
- Archibald Snatcher
- Ares
- Ares (God of War)
- Ares (Next Gen)
- Ares (Wrath of the Titans)
- Argleton
- Argos
- Arjen Rudd
- Arkham (Devil May Cry)
- Arklem Greeth
- Arktos (Tabaluga: The Movie)
- Arlecchino
- Arlo Sabian
- Armageddon (Chaos!)
- Armand Dorleac
- Armando Salazar
- Armin Metrac
- Armitage
- Arnim Zola (Marvel)
- Arnim Zola (Marvel Cinematic Universe)
- Arnold Flass (Batman: Caped Crusader)
- Aro
- Arondil
- Arquette
- Art the Clown
- Arthur
- Arthur Blessard
- Arthur Goodman
- Arthur Harrow
- Arthur Savage
- Arthur Walsh
- Arthur Watts (Justice League x RWBY)
- Arthur Watts (RWBY)
- Artus Greenhand
- Asa
- Asav
- Asgore Dreemurr (Negativetale)
- Ash Landers
- Ashad
- Ashnard
- Asimov (Luminous Avenger iX)
- Assef
- Astor
- Atomic Skull (Superman vs. The Elite)
- Atropos (Arrowverse)
- Atsushi Kanamoto
- Atticus Thorn
- Audrey Redheart
- Augus (Dragalia Lost)
- Aunt Gladys
- Aunt Ruth Chandler
- Auric Goldfinger
- Ava Lord
- Avalon
- Avon Hertz
- Axel Capek
- Aya Tokoyogi
- Ayaka Kamimochi
- Aylmer
- Ayush Patil
- Azar (Genshin Impact)
- Azazel (Fallen)
- Azazel (Tekken)
- Azog
- Azuras
- Azwel
- B.B. Hensley
- B. Frederick Judd
- BLU Medic (The Fedora Chronicles)
- Baal (Welcome to Demon School! Iruma-kun!)
- Baba Shakti
- Babidi
- Bacon Colonel
- Bacon General
- Bad Dream House
- Bad Rap
- Badger
- Badrang the Tyrant
- Bahamut
- Bahavas
- Bajillia Naire
- Bakasura
- Baker
- Ballas
- Ballista (They're Sticks, Probably)
- Banapur Khan
- Barbarus
- Barbatos
- Barkis Bittern
- Barnaba
- Barnaby Crookedman
- Baro
- Baron
- Baron Dark
- Baron Karza
- Baron Mordo
- Baron Praxis
- Baron Robotnik
- Baron Vladimir Harkonnen
- Baron Wolfgang von Strucker (Marvel)
- Baron Zebek
- Baron Zemo (The Avengers: Earth's Mightiest Heroes)
- Baroness Von Bon Bon (The Cuphead Show!)
- Barracuda
- Barry Convex
- Barry the Chopper
- Bartholomew Bogue
- Barty Crouch Jr.
- Bask Om
- Batari
- Bathsheba Sherman
- Batman (Catwoman: Guardian of Gotham)
- Bats
- Bayle the Dread
- Beadle Bamford
- Bear Thief
- Beast-Yeast Rulers
- Beast the One
- Beaugarde Lesko
- Beauregard Salt
- Beerus (Original Script)
- Bejo
- Bela
- Belial (The Legend of Atlantis)
- Bellroc
- Bellum (manga)
- Belzebuth (Belzebuth)
- Belzebuth (Shingeki no Bahamut)
- Belzeus
- Ben Childress
- Ben Gardner
- Benatu Eshu
- Benjamin Juma
- Bergan
- Bertron
- Beth
- Bev Keane
- Bezel (Isolation)
- Bibidi
- Big
- Big Bad Wolf (Foxymations)
- Big Dick Randy
- Big Fish Boss
- Big Jack Horner
- Big Smile Lee
- Big Tim
- Bigger Brother
- Biggie Bear
- Bike-Maniac
- Bill
- Bill Broth
- Bill Carver
- Bill Cipher
- Bill Cox
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