Acquarans (Farscape)
Aliens from Independence Day
Alien from The Greatest American Hero
Altarian Resistance (Galactic Civilizations)
Amnioni (Stephen Donaldson's The Gap Cycle)
Andorians (Star Trek)
Aenars - Andorian Subspecies (Star Trek)
Anterians (The Suite Life on Deck)
Argolin (Doctor Who)
Asari (Mass Effect)
Asgard (Stargate SG-1)
Atavus (Earth: Final Conflict)
Atevi (C. J. Cherryh's Foreigner series)
Bajorans (Star Trek)
Bandi (Star Trek)
Banik (Farscape)
Betazoid (Star Trek)
Black Arms (Shadow the Hedgehog)
Bolians (Star Trek)
Boolite (Farscape)
Bothans (Star Wars)
Breen (Star Trek)
Brunnen-G (Lexx)
Cardassian (Star Trek)
Centauri (Babylon 5)
Charrids (Farscape)
Chatilians (Battlelords of the 23rd Century)
Chigs (Space: Above and Beyond)
Chozo (Metroid series
Chronian ("Ben 10")
Colatas (Farscape)
Coreeshi (Farscape)
Cryons (Doctor Who)
Dakkamites (Marvel Comics)
The Dance (Marvel Comics)
Daxamites (DC Comics)
DearS (DearS)
Delvians (Farscape)
Deneans (Farscape)
Denobulans (Star Trek)
Drell (Mass Effect 2)
Deltans (Star Trek)
Dominators (Doctor Who)
Drahvins (Doctor Who)
Druuge (Star Control)
El-Aurians (Star Trek)
Eldar/Dark Eldar (Warhammer 40,000)
Elerians (Master of Orion)
Elves (descended from High Ones, see below) (Elfquest)
Emiri Kimidori (Haruhi Suzumiya).
Eridani (Battlelords of the 23rd Century)
Evons (Master of Orion)
Ewoks (Star Wars)
Ferengi (Star Trek)
Furons (Destroy All Humans!)
Galvan (Ben 10)
Galvanic Mechamorph ("Ben 10")
Grans (Star Wars)
The Graske (Doctor Who)
Geth (Mass Effect)
Gelth (Doctor Who)
Gamilons/Gamilus (Space Battleship Yamato/Star Blazers)
Gedds (Animorphs)
Gourmand ("Ben 10")
Gretchin/Grotz (small goblin like creatures who work for the Orks) (Warhammer 40,000)
Grudeks (Farscape)
Grunds (Marvel Comics)
Grue (Pitch Black)
Guardians of the Universe (DC Comics)
Halosians (Farscape)
Hangi (Farscape)
Hanudians (Kin-dza-dza!)
High Ones (Elfquest)
Hiigarans (Homeworld)
Hrossa (The Space Trilogy)
Hur'q (Star Trek)
Hydrans (Star Trek)
Hynerians (Farscape)
Ilanics (Farscape)
Ildirans (Saga_of_Seven_Suns)
Interions (Farscape)
Irkens (Invader Zim)
Jaridians (Earth: Final Conflict)
Jocaceans (Farscape)
Kafers (2300 AD)
Kaleds/Dalek (Doctor Who)
Kalish (Farscape)
Kanamit (The Twilight Zone, episode To Serve Man)
Karrema (Star Trek)
Kazon (Star Trek)
Khunds (DC Comics)
Khurtarnan (Farscape)
Kizanti (Battlelords of the 23rd Century)
Klingons (Star Trek)
Klowns ("Killer Klowns from Outer Space")
Kree (Marvel Comics)
Kweltikwan (Lilo & Stitch)
Kryptonians (DC Comics)
Kuyou Suou (Haruhi Suzumiya).
Kineceleran ("Ben 10")
Kymellians (Marvel Comics)
Laxidasians (Marvel Comics)
Leoniders (Noon Universe)
Loboan (Ben 10)
Lorwardians (Kim Possible)
Lunataks (Thundercats)
Lurmans (Doctor Who)
Luxans (Farscape)
Martians
Mangalores (the mercenary race of shapeshifter humanoids from The Fifth Element)
Manicoid (The Middleman)
Merseians (Ensign Flandry, by Poul Anderson)
Minbari (Babylon 5)
Misha (Battlelords of the 23rd Century)
Mondoshawan (The Fifth Element)
Moroks (Doctor Who)
The Moxx of Balhoon, (Doctor Who)
Mri (C. J. Cherryh's Faded Sun trilogy)
Mutzachans (Battlelords of the 23rd Century)
Naglon (Doctor Who)
Narn (Babylon 5)
Namekian (Dragon Ball)
Na'vi (James Cameron's Avatar)
Navs (Dan Dare)
Nebari (Farscape)
Neptunians (Futurama)
Neutrals (Futurama)
Nox (Stargate SG-1)
Oans (DC Comics)
Oannes (Stargate SG-1)
Ocampa (Star Trek)
Oculons (Ascendancy)
Ogrons (Doctor Who)
Opticoid ("Ben 10")
Orks (descendants of the Krork that grow from fungus) (Warhammer 40,000)
Ortheans (Mary Gentle's Golden Witchbreed) androgynous until puberty
Other Men (Star Maker by Olaf Stapledon)
Overlords (Childhood's End by Arthur C. Clarke)
Phagors (Brian W. Aldiss's Heliconia series)
Planet Alpha aliens from Kin-dza-dza!
Planet Uzm alien from Kin-dza-dza!
Phrygisians (Metroid Prime 3)
Petrosapian ("Ben 10")
Piscciss Volann ("Ben 10")
Plukanians (Kin-dza-dza!)
Porquinhos (Orson Scott Card's Speaker for the Dead)
Predators/Yautja (Predator)
Prot (K-PAX)
Protoss (StarCraft)
Psychlos (Battlefield Earth)
Pyronite ("Ben 10")
Quarian (Mass Effect)
Quadrainian (Extreme Dinosaurs)
Re'ol (Stargate SG-1)
Reigners (Hexwood by Diana Wynne Jones)
Relgarians (Farscape)
Rigellians (Marvel Comics)
Rigelians (Bravestarr)
Romulans (Star Trek)
Ryoko Asakura (Haruhi Suzumiya).
Saiyan (Dragon Ball)
Salarian (Mass Effect)
Sangheili (Halo series
Scarrans (Farscape)
Scorvians (Farscape)
Séroni (Space Trilogy)
Shi'ar (Marvel Comics)
Simians (Thundercats)
Snotlings (another of the green races collectively known to man as Orks) (Warhammer 40,000)
Sontarans (Doctor Who)
Sorn (Out of the Silent Planet)
Spirits (Stargate SG-1)
Splixson ("Ben 10")
Squigs (as snotlings) (Warhammer 40,000)
Surrakin (Stargate SG-1)
Suliban (Star Trek)
Sykarians (Farscape)
Sycorax (Doctor Who)
Syreen (Star Control)
Taelons (Earth: Final Conflict)
Taiidan (Homeworld)
Talaxians (Star Trek)
Tamaranians (Teen Titans)
Tarkans (Farscape)
Tatanga (Super Mario Land)
Tau (Warhammer 40,000)
Tavleks (Farscape)
Tectonese (Alien Nation)
Tellarites (Star Trek)
Terrians (Earth 2)
Tetramand ("Ben 10")
Thep Khufan ("Ben 10")
Therons (Dan Dare)
Time Lords/Gallifreyans (Doctor Who)
To'kustar ("Ben 10")
Trabe (Star Trek)
Transylian ("Ben 10")
Traskans (Farscape)
Trills (Star Trek)
Trolls (Elfquest)
Turian (Mass Effect)
Tusken Raiders (Star Wars)
Twi'leks (Star Wars)
Utwig (Star Control)
Vasudans (Descent: FreeSpace – The Great War)
Venek (Farscape)
Viltrumites (Invincible)
Vineans (Yoko Tsuno)
Vorc (Farscape)
Vorcarian (Farscape)
Vorcha (Mass Effect 2)
Vorta (Star Trek)
Vortians (Invader Zim)
Vorticon (Commander Keen)
Vortigaunt (Half-Life)
Vulcans (Star Trek)
Weevils (Torchwood)
Wraith (Stargate Atlantis)
Wookiees (Star Wars)
Xandarians (Marvel Comics)
Xindi (Star Trek)
Yuki Nagato (Haruhi Suzumiya).
Yuuzhan Vong (Star Wars)
Zabrak (Star Wars)
Zenetan (Farscape)
Zen 'Kethi (Star Trek)
Zenn-Lavians (Marvel Comics)
Zentradi (Macross), adapted as the Zentraedi in Robotech
Zen Rigeln (Battlelords of the 23rd Century)
Zen-Whoberis (Marvel Comics) - see also Gamora
Zygons (Doctor Who)
Near-relatives, ancestors or descendants of humans:
Abh (Crest of the Stars)
Adeptus Astartes (Space Marines) (Warhammer 40,000)
Ancients (Stargate SG-1/Stargate Atlantis)
Ankharans (Crossgen)
Androsynth, highly intelligent Homo sapiens clones. (Star Control)
Atlantines (Dan Dare)
Beastmen (Warhammer 40,000)
"Colonials" (Battlestar Galactica (2004 TV series))
Humanoid Cylons (Battlestar Galactica (2004 TV series))
Darrians (Traveller RPG) known for their small, high-technology polity
Eloi (The Time Machine)
Forest Guards (The Fall of the Towers by Samuel R. Delany)
Futurekind from Doctor Who.
Gethenians (Ursula Le Guin's Ekumen stories) and other HILFs.
Homo Drakensis (The Domination)
Homo Servus (The Domination)
Homo Superior in various stories
Itorloo (Raymond Z. Gallun's Seeds of the Dusk), remote descendants of mankind
Haemovores (vampiric creatures descended from humans, mutated by millennia of pollution) (Doctor Who)
Jaffa (Stargate SG-1)
Kull Warriors (Stargate SG-1)
Kromaggs (Sliders) killer apes who survived early evolution in a parallel Earth. Also considered Aliens From Another Dimension.
Ludens (Noon Universe)
Morlocks (The Time Machine)
Neanderthals (The Fall of the Towers by Samuel R. Delany)
Nebish (Half Past Human and The Godwhale by T.J. Bass (The name is not used in the second novel)).
Neosapiens (Exosquad)
Nietzscheans (Andromeda)
Orion Rogues (Battlelords of the 23rd Century)
Ogryns (Warhammer 40,000)
Pak (or Protectors) (Larry Niven's Known Space books) the superintelligent adult form of homo habilis; human Protectors are even more intelligent.
Primords (humans mutated into ape-like beasts) (Doctor Who)
Ratlings (Warhammer 40,000)
Sebaceans (Farscape)
Second through Last Men (Olaf Stapledon's Last and First Men)
Squats (now extinct Warhammer 40,000)
Spaceballs (race from a movie of the same name)
Terra Novans (Star Trek)
Toclafane (Doctor Who)
Underpeople - animals that have been modified to appear and act human. (Works of Cordwainer Smith)
Vilani (Traveller RPG) known for their bureaucratic tendencies and empire building
Zhodani (Traveller RPG) known for their psychic abilities
Note: In Star Trek: The Next Generation, the episode "The Chase" revealed that all the humanoid races in the galaxy are the result of genetic tinkering by a single humanoid race in the distant past. Similarly, in Marvel Comics' The Eternals, it was revealed that many species were genetically tampered with by the alien Celestials.
Feline humanoids:
Aslan (Traveller RPG)
Cathar (Star Wars)
Caitians from Star Trek (Only seen in the animated series and briefly in Star Trek IV: The Voyage Home)
Captain Amelia's species, from Treasure Planet
Cat People from Doctor Who.
Cat Girl Maids from UFO Ultramaiden Valkyrie
Centrans (Christopher Anvil's Pandora's Planet stories)
Cheetah People (Doctor Who From the final story of the original series Survival)
Cizerack (Battlelords of the 23rd Century)
Ctarl-Ctarl (Outlaw Star)
Fearcats Power Rangers: Operation Overdrive
Fefethil (Robert Westall's Urn Burial)
Felinetta or Cat-People (Doctor Who Missing Adventures: Invasion of the Cat-People by Gary Russell)
Fellpool or Hellpool (Star Ocean)
Futar (Dune)
Hani (C. J. Cherryh)
Hrubbans (Anne McCaffrey's Doona Series)
Kilrathi (Wing Commander games)
Klees (Pendragon series)
Krangs (Bravestarr animated space western TV series)
Kymnar (FTL:2448 RPG)
Kzinti (Larry Niven's Known Space series)
Lyrans (Star Trek)
Mephitisoids (Marvel Comics) - see also Hepzibah
Minggi (Barton Paul Levenson's Rain and Revenge)
Mrrshan (Master of Orion)
Na'vi (Avatar)
Thundereans (Thundercats)
Tiberians (Buzz Aldrin and John Barnes' Encounter With Tiber)
Tiger Men of Mars (Buck Rogers)
Tran (Alan Dean Foster's Icerigger)
Canine humanoids:
Canid (Penny Arcade)
Chief Anubis "Doggie" Cruger (Power Rangers: SPD)
Dr. Doppler's species, from Treasure Planet
Doog (Star Control)
Jackalmen (Thundercats)
Loboan (Ben 10)
Mawg (Spaceballs)
Melmacians (ALF)
Pemalites (Animorphs)
Shistavanen (Star Wars)
Vargr (Traveller RPG)
Insectoid and arachnid aliens:
Arachnids (Battlelords of the 23rd Century)
The Arachnid Omnivoracity from Starfire
Bees (Doctor Who)
Brood (Marvel Comics)
Bugs from Klendathu (Starship Troopers)
Bugs (Men in Black)
Collectors (Mass Effect 2)
The Colony (Final Days of the Planet Earth)
Cinnrusskin of James White's Sector General series
Drak (Farscape)
Driel (Dark Planet)
Drone (Halo 2)
Antlion swarm (Half Life 2)
Empress of the Racnoss from Doctor Who.
Formics (Ender's Game series by Orson Scott Card)
Gaim (Babylon 5)
Grue (Pitch Black)
The Inibit from Genesis Climber Mospeada (called "Invid" in the Robotech American adaptation)
Insects (The History of the Galaxy by Andrey Livadny)
Insects in Steph Swainston's Castle series.
Ilwrath (Star Control)
Klackons (Master of Orion)
Keepers (Mass Effect)
Klicks (Star*Drive)
Klikiss (Saga of Seven Suns)
The Lexx race (Lexx and "Little Lexx" from Lexx)
Locust (listed under insectoid because of their superorganism-like society, the various Locust types are similar to a variety of creatures such as arachnids, humans, monkeys, bats,
Queen type hive insects, jellyfish, and squid) (Gears of War)
Majat (Alliance-Union universe of C. J. Cherryh)
Mantis (Conquest: Frontier Wars)
Marmosians (Ascendancy)
Martians (Quatermass and the Pit)
Mind worms (Sid Meier's Alpha Centauri)
Menoptra (Doctor Who)
Mesklinites of Hal Clement's Mission of Gravity (millipede-like)
Nagrabs (Dan Dare)
Optera, (Doctor Who)
"Prawns" (District 9)
Rachni (Mass Effect)
Re'tu (Stargate SG-1)
Riders, highly aggressive inhabitants of Mother (Remnants)
Scrin (Command & Conquer 3)
Shadows (Babylon 5)
Shivans (Descent: FreeSpace – The Great War)
space spiders (Lost in Space)
Spider Aliens (Valiant Comics)
Lepidopterran (Ben 10)
Tachidi (Master of Orion)
Taxxons (from K. A. Applegate's Animorphs book series) (Centipede/worm-like).
Tecreaseans (Battlelords of the 23rd Century)
Than (Andromeda)
Thargoids from Elite (computer game)
Thranx of Alan Dean Foster's Humanx Commonwealth series
Tyranids from Warhammer 40,000
Tractators (Doctor Who)
Team Space Bug of Kaiju Big Battel
Uchuu Kaijuu ("Space Monsters") from Gunbuster
Ur-Quan Kohr-Ah (Star Control)
Ur-Quan Kzer-Za (Star Control)
The Vajra from Macross Frontier
Vore (Doctor Who: The Gallifrey Chronicles by Lance Parkin)
Wreaves (ConSentiency universe)
Wirrn (Doctor Who, The Ark in Space)
Xeno (Alone in the Dark)
Xenomorph (The Alien series)
Xindi (Star Trek)
Zarbi (Doctor Who)
Zerg (StarCraft)
Centaurs:
Andalites of K. A. Applegate's Animorphs
Garatron of K. A. Applegate's Animorphs
Ishtarians of Poul Anderson's Fire Time
K'kree of Traveller RPG
Pierson's Puppeteers of Larry Niven's Known Space series (sort of).
Tenebrians of Hal Clement's Close to Critical
Titanides of John Varley's Gaea Trilogy
Vedrans of Gene Roddenberry's Andromeda
Reptilians and amphibians:
Another popular form. See also Reptilian humanoid.
Aeodronians (Battlelords of the 23rd Century)
Badoon (Marvel Comics)
Bwaps (Traveller RPG) Also known as "Newts"
Caldarans (Andromeda)
Cardassians (Star Trek)
Chamachies (Ascendancy)
Chelonians (Doctor Who novels)
Dracs of Barry B. Longyear's The Enemy Papers stories
Draconians (Doctor Who)
Drakh (Babylon 5)
Dragonets (Anne McCaffrey)
Dragons (Anne McCaffrey)
Drell (Mass Effect)
Droyne (Traveller RPG)
Foamasi (Doctor Who)
Gorn (Star Trek)
Grendarl (Master of Orion)
the frog-like Gowachin of Frank Herbert's stories
Hazudra (Tyrian)
Hork-Bajir (Animorphs)
Hutts (Star Wars)
Hynerians (Farscape)
Ice Warriors (Doctor Who)
Jem'Hadar (Star Trek)
Keronian (KeroroGunso)
Krogan (Mass Effect)
Lithians of James Blish's A Case of Conscience
Makluans (Marvel Comics) - see also Fin Fang Foom
Mentors (Doctor Who)
Monoids (Doctor Who)
Omicronians / Popplers (Futurama)
Pfifltriggi (Out of the Silent Planet)
Python Lizards (Battlelords of the 23rd Century)
Raas (Master of Orion)
Ram Pythons (Battlelords of the 23rd Century)
Reapers (Doctor Who)
Reptilians (Thundercats)
Rills (Doctor Who)
Rodians (Star Wars)
The Race (Harry Turtledove's Worldwar)
Sakkra (Master of Orion)
Salarians (Mass Effect)
Sanghelli (Halo)
Saurians (Crossgen)
Saurids (Marvel Comics) - see also Ch'od
Scarrans (Farscape)
Sea Devils (Doctor Who)
Seekers/En'kull (Advent Rising)
Sheyangs (Farscape)
Silurians (Doctor Who)
Skaarjs (Unreal)
Skrulls (Marvel Comics)
Snake Men (Masters of the Universe)
Snarks (Marvel Comics)
Tagorians (Noon Universe)
Triceratons (Teenage Mutant Ninja Turtles)
Terileptils (Doctor Who)
Trandoshans (Star Wars)
Treens (Dan Dare)
Unas (Stargate SG-1)
Vaadwaur (Star Trek)
Vyrium (Conquest: Vyrium Uprising)
Vaxasaurian (Ben 10: Alien Force)
Velantians (Lensman books) notable for their multiplicity of eyes and various appendages
Vortisaurs (Doctor Who audio dramas)
Voth (Star Trek) - this species descended from Earth dinosaurs
Xindi (Star Trek)
Predator (Predator)
Yilane of West of Eden series of Harry Harrison
Zorgons (Zathura)
(and various variations of dinosaurs)
Aquatic species:
Aurelians (Advent Rising)
Babel fish (Douglas Adams)
Cosmobes (Dan Dare)
Decapodians (Futurama)
Delphons (The History of the Galaxy by Andrey Livadny)
Drell (Mass Effect)
Fludentri (Ascendancy)
Leerans (Animorphs)
Gungans (Star Wars)
Hanar ('Mass Effect')
Mon Calamari (Star Wars)
Quarren "Squid Heads" (Star Wars)
Nommo (Master of Orion)
Piscciss Premann (Ben 10)
Piscciss Volann (Ben 10)
Selkath (Star Wars)
Squeem (Xeelee Sequence)
Trilarians (Master of Orion)
The Vortex life forms (Ecco the Dolphin; assumed to be aquatic)
Xindi (Star Trek)
Parasites and symbiots:
Andromeni (Battlelords of the 23rd Century)
the "body snatcher pods" from The Body Snatchers (and its film adaptations)
Bebi (Dragonball GT)
Byrum (Mr. Gray) (Dreamcatcher (novel) by Stephen King)
Energy Rider (Farscape)
Goa'uld (Stargate SG-1)
Tok'ra (Stargate SG-1)
Ing (Dark creatures with the ability to possess living beings, the dead, and the artificially intelligent, who become darklings.) (Metroid Prime 2: Echoes)
the eponymous aliens of The Puppet Masters
the endosymbionts of Hal Clement's Needle and Through the Eye of a Needle
The eponymous Metroids
The Flood (Halo series)
Headcrab (Half-Life)
The Hive (Dark Skies)
The Invid (Robotech), adapted from the non-parasitic Imbit from Genesis Climber Mospeada
Iskoort (Animorphs)
Symbiotes (Venom and Carnage of Marvel Comics)
Trills (Star Trek)
The wind (Hooded Swan series)
the Wirrn, Krynoid, and Fendahl from Doctor Who
Ungooma (Ascendancy)
Xenocytes (Ben 10: Alien Force)
Ship (Ben 10: Alien Force)
Yeerks (Animorphs)
X Parasites (Metroid)
Xenomorph (Alien)
Black oil of the Colonists (X-Files)
the wind (Brian Stableford's Star Pilot Granger series)
Robotic and mechanical aliens:
Aliens that are created through technological means. This category also includes lifeforms that have been altered so that their existence depends on implants and other technologies.
Autons (Doctor Who)
Asurans (Stargate: Atlantis)
Berserkers (Fred Saberhagen's Berserker series)
Borg (Star Trek)
Bynars (Star Trek)
Chee (Animorphs)
Chmmr (Fusion species between the crystalline Chenjesu and the mechanical Mmrnmhrm.) (Star Control)
Consensus of Parts, the (Andromeda)
Outcast Consensus (Andromeda)
Cybermen (Doctor Who)
Cylons (Battlestar Galactica)
Cynoids (Master of Orion)
Daleks (Doctor Who)
Elysians (Mechanoids on Elysia built by the Chozo)) (Metroid Prime 3: Corruption)
The Geth (Mass Effect)
Gort (The Day the Earth Stood Still)
Grox (Spore)
Galvanic Mechomorphs (Ben 10)
Irkens (Invader Zim)
Kaalium (Moontrap)
Max (Flight of the Navigator)
Meklars (Master of Orion)
Metarex (Sonic X)
Minions (Ascendancy)
Mmrnmhrm (Star Control)
Mother (a massive ship capable of generating environments for captured races) (Remnants)
Necrons (Necrontyr given immortality by the C'tan) (Warhammer 40,000)
Phalanx (Marvel Comics)
Quintessons (Transformers)
Quarks (Doctor Who)
Reapers (Mass Effect)
Replicators (Stargate SG-1)
S'pht (Marathon)
Smash Martians
Technarchy (Marvel Comics)
Toclafane (Doctor Who)
Transformers:
Autobots
Decepticons
Maximals
Predacons
Vehicons
Rodents:
Baliflids (Ascendancy)
Ranat (Star Wars)
Argit (Ben 10: Alien Force)
Pierce (Ben 10: Alien Force)
Space-living creatures:
These fictional creatures purport to thrive in the biome of outer space.
Bentusi (Homeworld)
Budong (Farscape)
Forerunners (The History of the Galaxy by Andrey Livadny)
Gomtuu (Star Trek)
Leviathan (Farscape)
The Lexx race (Lexx and "Little Lexx" from Lexx)
Star Whale (Doctor Who)
Outsiders (Larry Niven's Known Space series)
The Acanti race from Marvel Comics.
Oswafts (vacuum-breathers from Lando Calrissian and the Star Cave of the Thonboka) (Star Wars).
Sentient plants & fungi:
The Arbryls (Ascendancy)
Audrey 2 (Little Shop of Horrors (musical))
Byrus (Dreamcatcher (novel) by Stephen King)
The Cotati (Marvel Comics)
Delvians (Farscape)
Deathworld Flora (found on planets like Catachan and Caliban (pre climactic explosion)) (Warhammer 40,000)
The Forest of Cheem (Doctor Who)
Florauna (Ben 10)
The Flowers of Lophai (Clark Ashton Smith)
The Frutmaka (Ascendancy)
The Krynoids (Doctor Who)
Lyekka (Lexx)
The Martians from Raymond Z. Gallun's Seeds of the Dusk
Methanosian (Ben 10: Alien Force)
The trees of Luton (Space 1999)
Mycon (Star Control)
Oscar from The Lotus Eaters
Skroderiders (Vernor Vinge's A Fire Upon the Deep)
Supox (Star Control)
The Thorian (Mass Effect)
Varga plants (Doctor Who)
Vervoids (Doctor Who)
Vulthoom (Clark Ashton Smith)
Wolfweeds (Doctor Who)
World 4470 (Hainish Cycle)
Ancient/Primordial races:
Aliens that have either disappeared and left only ruins or developed to godlike, practically omnipotent entities.
Unnamed and unseen aliens in the Space Odyssey series (In the prologue of 3001: The Final Odyssey they are called the "Firstborn", but never referred to as such in-story in any
novel in the series.)
Ancients (Descent: FreeSpace – The Great War)
Ancients (Farscape)
The Ancients (Alterans and Ori from Stargate)
Assassins (The Heechee Saga)
Ancients (Traveller RPG)
The Arisians and Eddorians of E. E. Smith's Lensman novels
Celestials (Marvel Comics)
Celestialsapien (Ben 10)
Chozo (Metroid)
Cocytans from Lucasarts' The Dig
H.P. Lovecraft's Elder Gods
Faranji from Star Sonata
The First Ones from Babylon 5
Forerunner (Halo)
Furlings (Stargate SG-1)
The Hanshaks from the Ascendancy Universe are an ancient race of toroidal mind-bodies.
Heechee (The Heechee Saga)
Iconians (Star Trek)
Jjaro (Marathon)
Kimera from Earth: Final Conflict
Metron from Star Trek:TOS
Mzungu from Star Sonata
The Necrontyr, who later became the Necrons (Warhammer 40,000)
Nox (Stargate SG-1)
both of Terry Pratchett's early science fiction novels, Strata and The Dark Side of the Sun, offer subversions of the paradigm
See also Arthur C. Clarke's short story "The Star"
Oans (DC Comics)
Nebula, the (Andromeda)
The races of the Occlith and the Voorqual (Clark Ashton Smith)
Old Ones (Warhammer 40,000)
Old Ones/Elder Things (H. P. Lovecraft)
Organians and Ancient humanoids (Star Trek)
Overmind, the (Childhood's End by Arthur C. Clarke
Paradine, the (Andromeda)
Psionics (Notrium)
Precursors (Star Control)
Precursor (Halo)
The Progenitors of (Homeworld 2)
Protheans (Mass Effect)
Protoculture (Macross)
Shadows (Babylon 5)
Shipwrights, the creators of Mother (Remnants)
Thrint or "Slavers", ancient rulers of the Galaxy in Larry Niven's Known Space universe
T'kon (Star Trek)
Thran (Magic: The Gathering)
UrQa from Star Sonata
Vazaha from Star Sonata
Vorlons (Babylon 5)
W'rkncacnter (assuming there is more than one) (Marathon)
Watchers (Marvel Comics)
Xel'Naga (StarCraft)
Xeelee (Xeelee Sequence)
Extremely exotic forms:
Aliens from Sector General by James White are among the most diverse. Crystalline methane creatures, continent sized carpets, rolling ring-shaped aliens, chlorine breathers,
radiation eating telepaths and creatures assembled from several symbiont species meet in a setting of space hospital.
Aliens that are product of mechanical evolution in The Invincible by Stanislaw Lem
The Animus (a telepathic alien intelligence with a corporeal form resembling an octopus) (Doctor Who)
Ark Megaforms (a non-humanoid race from Noon Universe, no information on appearance available)
Abyormenites of Hal Clement's Cycle of Fire (floating ballons - one race, that is)
Beta Renner cloud (Star Trek)
Black Cloud of Fred Hoyle (interstellar dust cloud)
Blue Meanies, armoured creatures that live on Mother, created to care for her (Remnants)
C'tan ('Star Vampires' worshipped and given corporeal form by the Necrontyr, only four still exist, only two of which (the Nightbringer and the Deceiver) are active, Mars (The Void
Dragon) is believed to be one that was covered by space dust over trillions of years ago) (Warhammer 40,000)
The Caleban of Frank Herbert's Whipping Star (invisible telepathic beings who are actually the minds of stars)
The Celareon of Conquest: Frontier Wars RTÉ Game, peaceful beings of pure energy. They constructed mechanical bodies with which they interact with his entourage, and they
control it by a cell where lie their true "body".
Chenjesu (intelligent silicon-based crystals) (Star Control)
Chronomyst (Ascendancy) sentient jellyfish-like creatures that communicate by refracting light within their bodies.
The Chtorr (pink wormlike creatures from David Gerrold's War Against the Chtorr series. According to David, the Chtorr can also refer to the entire alien ecology.)
Dnyarri (non-humanoid Telepaths) (Star Control)
The Doublers (two-in-one semi-humanoids of Stanislaw Lem's Eden)
Dralasite (an amoeboid race introduced in the Star Frontiers role-playing game)
Drej (a race responsible for the destruction of Earth; made out of pure energy, Titan A.E.)
The Dubtaks from the Ascendancy Universe remind of sperm cells.
Dugs (Star Wars)
Dyson Aliens (Peter F. Hamilton's "Pandora's Star")
Ego the Living Planet (Marvel Comics)
Eldila (barely visible faint, shifting light that are native to interplanetary space) (Space Trilogy)
The Face of Boe, (a giant head in a jar-like support system) (Doctor Who)
Father (Animorphs) an intelligent entity formed from a network of algae and alien corpses spread across an ocean planet.
Meehooks from the comic book series Fusion, "dinosaurs with fur"
Gadmeer who live in a sulphur environment. (Stargate SG-1)
Garrotian Snails (Noon Universe)
The Gelth (intelligent gaseous lifeforms) (Doctor Who)
Ghatanothoa of H. P. Lovecraft (has Gorgon-like visual properties)
Ghroth from Ramsey Campbell's short story "The Tugging" (small, sentient planet with a large red eye)
Giygas from EarthBound (Mother 2)
The Gladifers of Dennis Paul Himes
The Govorom species from the Ascendancy Universe are feminine-like spirits of nature.
Great Race of Yith of H. P. Lovecraft (Disembodied, time-hopping minds of a long-dead alien race; Known bodies used are gigantic molluscs and large beetles)
Grogs (conical sessile sentient telepaths in Larry Niven's Known Space universe)
Harmonia (The Sirens of Titan) a cave-dwelling flatworm-like race living on Mercury
Headies (a kynoid (dog-like) sentient race from Noon Universe)
Hivers of Traveller RPG (modified starfish)
Hooloovoo (non-corporeal beings, when refracted in a prism, appear as a shade of blue) (The Hitchhiker's Guide to the Galaxy)
Horta (Star Trek) silicon-based tunneller.
The Invaders of John Varley's Eight Worlds novels, higher-dimensional beings originating from a gas giant.
Kambuchka (Ascendancy).
Judoon (Humanoid Rhinos) (Doctor Who)
Kymellians (humanoid horses) (Marvel Comics)
Lloigor from Colin Wilson's Return of the Lloigor (Vortices of energy; Solidify as vast, alien reptiles)
Logrians from Andrey Livadny's The History of the Galaxy series (two-headed xenomorphs)
Ly-Cilph (begin their lives as corporeal, but can latter become non-corporeal being) (Night's Dawn Trilogy)
The Macra (giant crab-like aliens with telepathic and hypnotic ability) (Doctor Who)
Mars People of the Metal Slug series (intelligent creatures resembling squids or octopi, sporting a great amount of tendril-like tentacles)
The Martians from H.G. Wells's The War of the Worlds
The Martians from Olaf Stapledon's Last and First Men, sentient cloudlets composed of countless microscopic particles
Mebes (Giant single-celled sentient organisms from the Ascendancy Universe)
Melnorme (Star Control)
Methorians of Barrington J. Bayley's Zen Gun (gaseous giant-giant dwellers)
Medusans (Star Trek) an incorporeal race who cannot be looked at by humanoids.
Nimbuloids (a species of large sentient gas creatures from the Ascendancy Universe)
Oankali of Octavia Butler's Xenogenesis series
Orfa (Ascendancy)
Ogri (silicon-based life form resembling standing stones) (Doctor Who)
Pan Spechi (each individual has five different bodies, occuping each one throughout their life time) (ConSentiency universe)
Puppeteers of Larry Niven's Ringworld and Known Space series (three legs, two manipulative heads)
Pilots (Farscape)
Phantoms (a ghost-like race from Final Fantasy: The Spirits Within)
Photino Birds (made up of Dark Matter) (Xeelee Squence)
Pkunk (appear like Toucans) (Star Control)
Prophets (Star Trek)
Qax (Xeelee Squence)
Rigellians (Lensman books) which are barrel-shaped with four tentacular arms and four stubby legs
Mr. Saturn (EarthBound)
The Scrin of Command & Conquer, an intelligent species of unknown form which are apparently symbiotic with the crystal, root and spore, Tiberium.
Shevar (Ascendancy) an inorganic race from an alternate universe that feeds on life force.
Shoggoths (H. P. Lovecraft)
Silicoids (a race of sentient crystals in the Master of Orion universe)
The Slitheen (or, more accurately, Raxicoricofallopatorians — Slitheen is a family name, not the species), bipedal, vaguely humanoid creatures with sharp claws and baby faces,
made of living calcium, (Doctor Who)
Slylandro (Star Control)
The Snovemdomas from the Ascendancy Universe are similar to mammoths.
Solaris by Stanislaw Lem (living ocean)
Spathi (similar to shellfish) (Star Control)
Sphere (Sphere (novel) by Michael Crichton)
Spline (whalelike creatures that rebuilt themselves into living ships) (Xeelee Squence)
Swaparamans (Ascendancy)
Tetraps (vaguely humanoid bat-like creatures with four eyes allowing 360 degree vision) (Doctor Who)
Tholians (Star Trek)
Thraddash (boar- or rhino-like creatures with whiskers) (Star Control)
Tralfamadorians of Kurt Vonnegut (The Sirens of Titan, Slaughterhouse 5)
Treecats - Six-limbed cats (Honor Harrington Series)
Trillions of Nicholas Fisk (small collective crystals)
Trisolians (Humanoid creatures made out of liquid) (Futurama)
Taprisiots (Whipping Star, The Dosadi Experiment)
Tweel from A Martian Odyssey
Umgah (large, pink or lilac-colored blobs) (Star Control)
Utroms (Teenage Mutant Ninja Turtles)
VUX (green tentacular creatures) (Star Control)
Wanderers (most mysterious of the Noon Universe races, no information about their appearance is available, but most likely they're non-humanoid)
Watchers In The Dark (highly telepathic creatures that inhabit the ruins of Caliban, home of the Dark Angels Space Marine Chapter) (Warhammer 40,000)
Yag-Kosha (from Robert E. Howard's The Tower of the Elephant) (humanoid elephant)
Yehat (pterodactyl-like creatures) (Star Control)
Yuggs (Maggot-like)
Zebesian Space Pirates (Metroid series — the species has a wide range of morphological variety)
Zonama Sekot - a sentient planet with mysterious, powerful abilities. (Star Wars)
Zoq-Fot-Pik (Star Control)
Shape-shifting aliens:
Capelons (Ascendancy)
Aylee - (Sluggy Freelance) - Shapeshifts every stage of the lifecycle
Clawdite - (Star Wars)
Chameloids (Star Trek)
Changelings (Star Trek)
Changers (Consider Phlebas by Iain M. Banks)
Darlok (Master of Orion)
Durlans (the race of Chameleon Boy from the Legion of Super-Heroes) (DC Comics)
Extraterrestrial Living-metal Shape-shifter (ELS), the race of techno-organic sentient aliens from Mobile Suit Gundam 00 the Movie: Awakening of the Trailblazer
The Green and White Martians of the DC universe - see also Martian Manhunter
High Ones (Elfquest)
Krillitanes (Doctor Who)
Makluans (Marvel Comics) - see also Fin Fang Foom
Mangalores (the mercenary race of shapeshifters from The Fifth Element)
Martians (Invincible)- see Shapesmith
Mazians (Battlelords of the 23rd Century)
Plasmavore (Doctor Who)
Rutans (Doctor Who)
Silkies (The Silkie by A. E. van Vogt)
The Skrulls (Marvel Comics)
Star Kings (Star King by Jack Vance)
Time Lords/Gallifreyans (Doctor Who) - see Regeneration
Uryuom (El Goonish Shive)
Iznicans in (Non-Canon Star Wars)
Limax (Ben 10)
Thing (John Carpenter's The Thing)
Unintelligent creatures:
These fictional extraterrestrials display no signs of sentience.
Banthas (Star Wars)
Colour out of space by H. P. Lovecraft (disputed)
Dentics (Farscape) - Non-sentient insectoids used by humanoids to clean their teeth.
Flat cats from Robert A. Heinlein's novel The Rolling Stones
Gizka (Star Wars)
Horda (Doctor Who)
(devolved) Macra (Doctor Who)
Sandworm (Dune)
Skrills (Earth: Final Conflict)
Spoo (Babylon 5)
Tribbles (Star Trek)
Varga plants (Doctor Who)
Venom grubs (Doctor Who)
Wolfweed (Doctor Who)
Aliens from other dimensions:
5th dimensional imps (DC Comics also see Mr. Mxyzptlk)
Annihilus, Blastaar and other natives of the Negative Zone (Marvel Comics)
The Anti-Monitor (DC Comics)
Arilou (Star Control)
Bakugan
The Celestial Toymaker (Doctor Who)
Daemons/Daemonettes (Warhammer 40,000)
Digimon (Digimon)
The D-Reaper from Digimon (Toei Animation)
The DigiGnomes from Digimon (Toei Animation)
Hounds of Tindalos-Mysterious, angular, timeless beings with no accurate given description. (Frank Belknap Long)
Krang
Khorne (Warhammer 40,000)
The Krith of Richard C Merediths Timeliner Trilogy
Lawbringers (Crossgen)
Micronauts
nDs (Invasion: Earth)
Nurgle (Warhammer 40,000)
Orbulon of the WarioWare series
Orz (Star Control)
Q (Star Trek)
Qwardians (DC Comics)
Reapers (Doctor Who)
Sau-Bau (Battlelords of the 23rd Century)
Servitors of the Outer Gods (H. P. Lovecraft)
Slaanesh (Warhammer 40,000)
Species 8472 (Star Trek: Voyager)
Sphere Builders (Star Trek)
The Spineless Ones (Marvel Comics) - see also Mojo
The Technet (Marvel Comics)
Them (The Homeward Bounders by Diana Wynne Jones)
Tzeentch or in fact all chaos gods(Warhammer 40,000)
Unnamed telepathic aliens of Babylon 5: Thirdspace
Warwolves (Marvel Comics)
Warp entities (Warhammer 40,000)
Galactic communities:
Interstellar governments or communities in which several alien civilizations interact.
Babylon 5's Babylon Project and later the Interstellar Alliance
The Borg Collective (Star Trek)
The Covenant (Halo)
The Citadel ((Mass Effect))
The ConSentiency universe (Frank Herbert's The Dosadi Experiment)
Galactic Patrol (E.E. Smith)
Pfhor (Marathon)
Star Trek's United Federation of Planets
Star Wars's Galactic Empire, Galactic Republic, and New Republic
Systems Commonwealth (Andromeda)
The Tau Empire (Warhammer 40,000)
The Eye of Terror (Home of many Chaos Space Marines Legions, Warhammer 40,000)
The Imperium of Man (Human civiazation in 40,000 AD)
Dalek Empire
Data Integration Thought Entity and the Sky Canopy Domain from the Haruhi Suzumiya series.
Galactic Federation (Metroid)
High Council of System Lords (Stargate SG-1)
Psychlo Government (Battlefield Earth)
Machine Empire (Power Rangers)
Yuuzhan Vong Empire (Star Wars)
Dominion (Star Trek)
Klingon Empire (Star Trek)
Cardassian Union (Star Trek)
Romulan Star Empire (Star Trek)
Kelvan Empire (Star Trek)
Uplift series by David Brin depicts pan-galactic community of various alien species
Known Space by Larry Niven on a smaller scale
United Galactic Federation/Galactic Alliance (Lilo and Stitch)
Ur-Quan Hierarchy (Star Control)
Galactic Alliance (Buzz Lightyear of Star Command)