- "Them"
- "They" (Star Control)
- 'Owon
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- 031 Exuberant Witness
- 2-1B
- 2401 Penitent Tangent
- 2I's species
- 333
- 343 Guilty Spark
- @At
- A'askvarii
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- ALF Universe
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- Aaamazzarite
- Aakon
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- Aayla Secura
- Ab'Ugartte
- Ab-human
- Aballonian
- Abbadon's species
- Abbai
- Abductor
- Abe
- Abednedo
- Abin Sur
- Abinyshi
- Aboleth
- Abomination
- Abomination (Fallout)
- Abominor
- Abonsheean
- Above
- Abyormenite
- Abyssin
- Abzorbalovian
- Academy
- Acanti
- Acartian
- Acceptor
- Acceptor (Uplift Universe)
- Accipiptero
- Achernonian
- Achom
- Acid Lizard
- Ackdarian
- Acklay
- Acquaran
- Acrobatic Fish
- Acrosian
- Actual Universe
- Adarian
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- Addwaitya
- Adenian
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- Adipose
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- Admiral B'tang
- Admiral B’tang
- Adnerem
- Adorian
- Adosian Slug
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- Advent
- Advosze
- Advozse
- Adwaita
- Aealacreatrananda
- Aedian
- Aedians
- Aefan
- Aegenan
- Aenar
- Aeolian
- Aeosian
- Aepox
- Aerophibian
- Aerophyte
- Aesdherian
- Aesir (Freespace)
- Aesiri (Roswell Conspiracies)
- Aether Drake
- Aethersteed
- Aethion
- Af'El Lion
- Affytechan
- Aganof
- Agee
- Agent Pleakley
- Agent X's Species
- Aggedor
- Aggoron
- Aggregor
- Aggressiveness Level
- Agharta
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- Agletsch
- Agolian Blob
- Agon Bearerpod
- Agorffi
- Agr
- Ahamkara
- Ahannu
- Ahbiilok
- Ahimsa
- Ahra Naffi
- Ahsoka Tano
- Aihai
- Ail
- Ailon
- Ailon (Species)
- Ailoprobe
- Aing-Tii
- Air Elemental
- Air Hammer
- Air Whale
- Airam
- Airborne Algae Sack
- Airsquid
- Airsquid (Alien Legion)
- Airthorn
- Aiwha
- Ajisa
- Ak'Haireth
- Akata
- Akhaten
- Akhaten Mummy
- Akiridion
- Akk Dog
- Akkabarran
- Akko Grain
- Akl-bing
- Akman
- Akrennian
- Akrennian Beetle
- Akrid
- Aksellan
- Akul
- Akurian
- Akwin
- Al Packa
- Alabamian
- Alabyew
- Alain
- Alan (Hungry Shark)
- Alan Wrench
- Alarevi
- Alashan
- Alata Nimos
- Alavarian
- Alazhi
- Albeniz
- Alcaak Dystopia
- Alcidian
- Alcoon
- Aldebaran (Bucky O'Hare)
- Aldebaran Beidafang
- Aldebaran Eel
- Aldebaran Empire
- Aldebaran Gopher
- Aldebaran Mud Leech
- Aldebaran Serpent
- Aldebaranian
- Aldereenian
- Alec Baldwin
- Aleena
- Alexander of Brennenburg
- Alfa 177 canine
- Alflololian
- Algernon (Spore)
- Algolian
- Algorian Mammoth
- Alibar
- Alien
- Alien (12 to the Moon)
- Alien (A Centaur's Life)
- Alien (A Close Encounter with a Strange Kind)
- Alien (A Walk in the Dark)
- Alien (Alien Abduction, 2005)
- Alien (Alien Abduction 2005)
- Alien (Alien Apocalypse)
- Alien (Alien Hunter)
- Alien (Alien Lockdown)
- Alien (Alien Outpost)
- Alien (Alien Simulator)
- Alien (Alien vs. Hunter)
- Alien (Aliens: Earth Angel)
- Alien (Aliens: Incubation)
- Alien (Aliens: Taste)
- Alien (Allegiance)
- Alien (American Warships)
- Alien (Animal Crossing: The Movie)
- Alien (Apollo 18)
- Alien (Assimilate)
- Alien (Attack the Block)
- Alien (Battle: Los Angeles)
- Alien (Bermuda Tentacles)
- Alien (Close Encounters of the Third Kind)
- Alien (Dino Run)
- Alien (Dinosaurs vs. Aliens)
- Alien (Earth 21)
- Alien (Extraterrestrial)
- Alien (Extraterrestrial, 2014)
- Alien (Fallout 3)
- Alien (Fantasy)
- Alien (Ferocious Planet)
- Alien (Final Days of Planet Earth)
- Alien (Fine Tuning)
- Alien (Fire Serpent)
- Alien (Fire in the Sky)
- Alien (Gadget and the Gadgetinis)
- Alien (Garfield)
- Alien (Gracefield Incident)
- Alien (Grand Theft Auto)
- Alien (Grand Theft Auto V)
- Alien (H. G. Wells' War of the Worlds)
- Alien (Heatstroke)
- Alien (Hellboy)
- Alien (High Plains Invaders)
- Alien (Horror Express)
- Alien (Hybrids)
- Alien (I Married a Monster from Outer Space)
- Alien (Inseminoid)
- Alien (Invasion of the Saucer Men)
- Alien (It Came from Outer Space)
- Alien (Kit Kat)
- Alien (LEGO Mars Mission)
- Alien (Laserblast)
- Alien (Latent Image)
- Alien (Lost Tapes)
- Alien (Love is the Plan the Plan is Death)
- Alien (Mr. Wuffles!)
- Alien (Night Skies)
- Alien (Night of the Blood Beast)
- Alien (Oculus Dreamdeck)
- Alien (Parents from Space)
- Alien (Plan 9 from Outer Space)
- Alien (Reactor)
- Alien (Red Dead Redemption 2)
- Alien (Riverworld 2003)
- Alien (Savage Planet)
- Alien (Scooby-Doo and the Ghoul School)
- Alien (Sherman's Lagoon)
- Alien (Signal Simulator)
- Alien (Signs)
- Alien (Skyline)
- Alien (Spielberg's War of the Worlds)
- Alien (Star Runners)
- Alien (Stowaway)
- Alien (Taken)
- Alien (Teenagers from Outer Space)
- Alien (The Adventures of Tintin)
- Alien (The Ambassadors of Death)
- Alien (The Chameleon)
- Alien (The Darkest Hour)
- Alien (The Faculty)
- Alien (The Green Slime)
- Alien (The Hive)
- Alien (The Invasion of the Scooby Snatchers)
- Alien (The Man from Planet X)
- Alien (The Mercury Men)
- Alien (The Muppet Show)
- Alien (The Screwfly Solution)
- Alien (The Trollenberg Terror)
- Alien (They Live)
- Alien (Thirst)
- Alien (UFO)
- Alien (Visitors from Down the Street)
- Alien (When Aliens Attack)
- Alien (You'll Never Go Home Again)
- Alien (Youth)
- Alien (Zig & Sharko)
- Alien 3000
- Alien Agents (The Arrival, 1996)
- Alien Agents (The Arrival Films)
- Alien Agents (The Original Arrival Films)
- Alien Animal Tamer
- Alien Bear
- Alien Benefactors (Secret Identities)
- Alien Bira
- Alien Brain
- Alien Bunny
- Alien Cockroach
- Alien Didi
- Alien Dog
- Alien Duck
- Alien Entities (Arma 3: Contact)
- Alien Faces
- Alien Green Six-legged Lizard (Futurama)
- Alien Grunt
- Alien Hominid
- Alien Jackal
- Alien Milkshake Bartender
- Alien Object
- Alien Parasite (Rick and Morty)
- Alien Planet
- Alien Queen
- Alien Reef (Hungry Shark)
- Alien Species Gallery
- Alien Species Gallery (0-9)
- Alien Species Gallery (A)
- Alien Species Gallery (B)
- Alien Species Gallery (C)
- Alien Species Gallery (D)
- Alien Species Gallery (E)
- Alien Species Gallery (F)
- Alien Species Gallery (G)
- Alien Species Gallery (H)
- Alien Species Gallery (I)
- Alien Species Gallery (J)
- Alien Species Gallery (K)
- Alien Species Gallery (L)
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- Alien Species Gallery (N)
- Alien Species Gallery (O)
- Alien Species Gallery (P)
- Alien Species Gallery (Q)
- Alien Species Gallery (R)
- Alien Species Gallery (S)
- Alien Species Gallery (T)
- Alien Species Gallery (U)
- Alien Species Gallery (V)
- Alien Species Gallery (W)
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