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This list of fictional extraterrestrial species is subsidiary to the lists of fictional species and is a collection of various notable extraterrestrial species that appear in various works of fiction. It is limited to well-referenced examples from literature, film, television, comics, animation and video games. This list excludes cases in which only a single member of a species is shown, such as E.T. the Extra-Terrestrial.
This section deals with notable species from published works, including short-stories, novels, novellas and poems.
- List of ''Discworld'' alien species
- List of Known Space alien races
- List of Noon Universe alien races
- List of ''Revelation Space'' alien races
- List of ''Sector General'' alien races
- The War of the Worlds
- Culture series
This section deals with species that are depicted in comic books or strips, manga or similar works.
- List of DC Comics alien races
- List of Marvel Comics alien races
- Trolls, a dubiously insectoid humanoid race hailing from Alternia, in Homestuck.
- Cherubs, a solitary species where two individuals take turns inhabiting the same body, in Homestuck.
- Carapacians, an artificial species created to fight a war, in Homestuck.
This section deals with feature-length films or made-for-television movies.
- Species of the Marvel Cinematic Universe
- List of Star Wars alien creatures
- List of Star Wars alien races: A–E, F–J, K–O, P–T, U–Z
This section deals with television shows.
- List of Babylon 5 alien races
- List of Doctor Who alien species
- List of Earth: Final Conflict alien races
- List of Ben 10 alien races
- Lilo & Stitch alien races
- Genetic experiments (artificial lifeforms)
- Gems (Steven Universe)
- Irkens (Invader Zim)
- Teletubbies (Teletubbies)
- Bortronians (Ready Jet Go!)
- Galrans and Alteans (Voltron: Legendary Defender)
- Kang and Kodos (The Simpsons)
- The Mysterons (Captain Scarlet and the Mysterons)
- Akiridions ( 3Below: Tales of Arcadia )
- List of Ratchet & Clank alien races
- List of Half-Life alien races
- List of Andromeda Six alien races
- List of Homeworld and Homeworld 2 alien races
- List of Star Control alien races
- List of StarCraft alien races
- Races from the Halo universe
Fictional alien characters by type
- List of humanoid aliens
- List of non-sentient aliens
- List of reptilian humanoids
- List of robotic aliens
- List of amphibious aliens