- Arakkoa
- Arakshu
- Aramandi
- Araquia
- Arathim
- Arbazan
- Arbok
- Arbonian
- Arboreal Octopus
- Arbran
- Arbryl
- Arburian Carcharodon
- Arburian Pelarota
- Arcadian
- Arcadroid
- Arcateenian
- Arcean
- Arceans
- Arch-vile
- Archa Seven Arachnid
- Archanan
- Archein
- Archelus
- Archeopian
- Archibald (Spore)
- Archime
- Architect
- Architect (The Final Architecture)
- Architects of Algol
- Archon (Doctor Who)
- Archtree
- Arcon's species
- Arconan
- Arcosian
- Arctic-Strider
- Arctic Blue
- Arctic Cactus
- Arctic Cannon Beetle
- Arctic Horny Whelmer
- Arctic Ice Hound
- Arctic Leviathan
- Arctic Polar-vane
- Arctic Ray
- Arctic Sedge Slider
- Arctic Spawn
- Arctic Tripedalien
- Arcturan
- Arcturan (Doctor Who)
- Arcturan (Goosebumps)
- Arcturan (Marvel)
- Arcturan Canista
- Arcturian (Resident Alien)
- Arcturian (Spaced Invaders)
- Arcturian (Star Trek)
- Arcturian (Treasure Planet)
- Arcturian Dog Bird
- Ardakian Trawl
- Ardennian
- Ardent Mage
- Ardentian
- Ardilus
- Ardurian Roc
- Ardusian
- Areore
- Aretian
- Arfal Living Jewels
- Arfgardian
- Argazdan
- Argenta
- Argit's Species
- Argoan
- Argolin
- Argonan
- Argonian
- Argonian (Teenage Mutant Ninja Turtles)
- Argonite
- Argonoid
- Argora
- Argrathi
- Argullian
- Arian
- Arianna
- Aridian
- Aridian (Gilligan's Planet)
- Aridinian
- Arien
- Arietta Bird
- Arilou Lalee'lay
- Ariolo
- Arion
- Arisian
- Arkanian
- Arkarian
- Arkborn
- Arkenite
- Arkeyan Warrior
- Arkeyans
- Arkillo's Species
- Arkonian
- Arkudan
- Arlatan
- Arlian
- Armadon
- Armalig
- Armanian Gucci Monster
- Armashlis
- Armor
- Armor Hunters
- Armorback
- Armored Cannon Beetle
- Armored Eel
- Armored Krakkiss
- Armored Mawdad
- Armorizer
- Armurk
- Armus
- Army of Terror
- Arn
- Arn (Class)
- Arnassian
- Arnor
- Arpor-Lan
- Arquillian
- Arquindae
- Arrack
- Arrak Snake
- Arrakisian
- Arrat
- Arretan
- Arrik
- Arrowheads (Alien Worlds: Your Guide to Extraterrestrial Life)
- Arrowtongue
- Arslycan
- Artakha
- Arthropod
- Arthur Douglas
- Articulated Angstok
- Artificial Human
- Artificial Sun
- Artificial lifeform
- Artillery Drone
- Artisan Class
- Aruhuan
- Arusian
- Aruzan
- Aryghr
- Arysum-Kormn
- Asaari Tree
- Asari
- Ascarid
- Asgard (Stargate)
- Asgardian
- Ash Angel
- Ash Graven
- Ash Wraith
- Ashenkoghli
- Ashla
- Ashonas
- Ashtar
- Askajian
- Askhew
- Asogian
- Asora Makabe
- Aspan
- Aspirant
- Asratian
- Ass-blaster
- Assault Spider
- Assault Spider (Lanfeust of Troy)
- Assembler (Star Wars)
- Assimilating races
- Assiti
- Astaroth
- Asterite
- Asteroid Worm (Samurai Jack)
- Asteromorph
- Astral Drifter
- Astran
- Astrazoan
- Astro Zombie
- Astromech Droid
- Astropath
- Astrophage
- Astrotot
- Asuran
- Asuryani
- Asymmetric Person
- Asyyyriak
- Ataderician
- Atarkis
- Atasian
- Atavus
- Atheleni
- Athshean
- Atlach-Nacha
- Atlan Predator
- Atlan Scavenger
- Atlantean
- Atlantean (Crux)
- Atlantean (DC)
- Atlantean (Marvel)
- Atlantean (Nadia: The Secret of Blue Water)
- Atlantean (Serious Sam)
- Atlantean (SpongeBob SquarePants)
- Atlas Crab
- Atmospheric Beast
- Atoan
- Atomic (Metroid)
- Atomix's Species
- Atraxi
- Atrean
- Atrian
- Atrocian
- Atrocian Predator
- Atrurk
- Atta
- Attender Class
- Atuuk
- Atzerrian Meek
- Aucturn
- Audrey II
- Aughra
- Augments
- Aulacri
- Aura Beasts
- Auran
- Aurelian
- Aurelian Water Lily
- Aurigaen
- Aurigan
- Aurigan Cave Demon
- Auronar
- Aurora Unit
- Aurum
- Author (All Tomorrows)
- Authority
- Autoad
- Autocron
- Autom
- Automated Repair Station
- Automaton (Endless Space)
- Automaton (Helldivers)
- Automaton (The Empty Planet)
- Automaton (Voyager)
- Automobile
- Auton
- Autoroller
- Autotrooper
- Autrack
- Avatar
- Avatar (Birthdays: The Beginning)
- Avatar (XCOM)
- Aver
- Avian
- Avian (Doctor Who)
- Avians (Starbound)
- Avidae
- Avin
- Avin's Species
- Avion
- Avoghai
- Avogwi
- Avoni
- Avril
- Aw Sembli
- Awareness
- Awoken
- Awoken (Stellaris)
- Axanar
- Axel-tree
- Axi-Tun
- Axlo
- Axturian
- Ayalea
- Ayrou
- Ayug
- Azathoth
- Azin Mo
- Azoranth
- Azra Uttus
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