List of fictional alien species: A

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Name Source Type
Aaamazzarite Star Trek Hairless humanoids that create objects biochemically from their mouths
Aalaag Gordon R. Dickson's Way of the Pilgrim
Abh Crest of the Stars Genetically-enhanced humans
Abductors Invader Zim, Squee
Abzorbalof Doctor Who Human-absorbing humanoid
Abyormenites Hal Clement's Cycle of Fire floating balloons
Acamarian Star Trek
Acquarans Farscape Humanoid
Adipose Doctor Who Tiny, round humanoids made of fat
Advent Sins of a Solar Empire Humanoid
Advents (aka Uranus or the Creators) Guyver: The Bioboosted Armor
Aenar Star Trek Telepathic humanoid
Aeodronians Battlelords of the 23rd Century
Affront Iain M. Banks' Excession
Agorian Ratchet & Clank
Akaali Star Trek
Akrennians Titan A.E. Rat/hyena-like humanoids who apparently do not dream (or bathe much); the character Preed is an Akrennian. The food "Akrennian Beetle Sushimi" is also featured in the film, hinting that insect-like life-forms are also found on their home planet.
Akritirians Star Trek
Albategna The webcomic Not So Distant Large black-and-white creatures with six tentacular limbs (two for walking and four for manipulating)
The Alien Satyajit Ray's The Alien and Banku Babu's Friend
Alien The Hidden and its sequel Parasitic and having the capability to possess its host
Alien Sex Goddesses Church of the SubGenius
Alkari Master of Orion
Allasomorph Star Trek
Amaut C. J. Cherryh's Alliance-Union universe
Altarians Galactic Civilizations Humanoid
Amazonians Futurama Giant humanoid women. Men of this species have died out.
Amnioni Stephen Donaldson's The Gap Cycle Humanoid
Amorphs Schlock Mercenary
Anabis The Voyage of the Space Beagle by A. E. van Vogt
Ancients Farscape
Ancients Freespace Technologically advanced beings that were wiped out several thousand years ago. Unknown physical description.
Ancient Stargate SG-1 Humans from Earth, with a developed intelligence, who in the age of the creation of the pyramids, left Earth for universe exploration.
Andalites K. A. Applegate's Animorphs Centaur-like, with non-poisonous scorpion tails, and blue fur
Andorians Star Trek Humanoid with blue skin, white hair, antennae
Andromeni Battlelords of the 23rd Century
Angol Mois Sgt. Frog
Angosians Star Trek
Anodite Ben 10 Alien Force
Antarans Master of Orion II Marauders exiled to a pocket dimension
Antarians Imperium Galactica II: Alliances
Antedeans Star Trek
Anterians The Suite Life on Deck
Anticans Star Trek
The Anti-Monitor DC Comics
Aqualish Star Wars
Aquatoids X-COM: Terror from the Deep
Arachnids Battlelords of the 23rd Century
Arachnoids Serious Sam: The First Encounter Scorpion-like
Aras Perry Rhodan
Arbryls Ascendancy
Arburian Pelarota Ben 10
Arcadians Star Trek
Arceans Galactic Civilizations
Arcturians Star Trek
Argolin Doctor Who Humanoid
Arilou Lalee'lay Star Control Humanoid - 'Grey' alien
Arisians and Eddorians E. E. Smith's Lensman novels
Ark Megaforms Noon Universe
Arkonides Perry Rhodan
Armada of Annihilation Axelay
Arquillians Men in Black
Airlia Area 51 novel series by Robert Doherty Humanoid, see moai
Arnor Galactic Civilizations II: Dread Lords
Asari Mass Effect Blue-skinned feminine humanoids
Aschen Stargate SG-1 Humanoid
Asgard Stargate SG-1 Grey humanoid
Aslan Traveller RPG Feline humanoid
Asuran Stargate Atlantis
Atavus Earth: Final Conflict Humanoid
Atevi C. J. Cherryh's Foreigner series Tall, dark, mysterious humanoids. Culture progresses rapidly from steam-age to contemporary and beyond perhaps due to their numerological language. Assassin's Guild rather than police.
Aurelians Advent Rising
Autobot Transformers A machine race that can transform between a humanoid form and that of a certain machine, depending on the specific Autobot
Auronar Blake's 7
Autons Doctor Who Living plastic beings
Axanars Star Trek
Axons Doctor Who
Azathoth Cthulhu Mythos
Azgonians Perry Rhodan
Aziam Battlelords of the 23rd Century