Alien primarily refers to:
- Alien (law), a person in a country who is not a national of that country
- Enemy alien, the above in times of war
- Extraterrestrial life, life which does not originate from Earth
- Specifically, a lifeform with extraterrestrial intelligence
- For fictional extraterrestrial life, see Extraterrestrials in fiction
- Introduced species, a species not native to its environment
Alien(s), or The Alien(s) may also refer to:
Science and technology
- AliEn (ALICE Environment), a grid framework
- Alien (file converter), a Linux program
- Alien Technology, a manufacturer of RFID technology
Arts and entertainment
- Alien (franchise), a media franchise
- Xenomorph, the titular alien in the franchise
Films
- Alien (film), a 1979 film by Ridley Scott
- Aliens (film), second film in the franchise from 1986 by James Cameron
- Alien 3, third film in the franchise from 1992 by David Fincher
- Alien Resurrection, fourth film in the franchise from 1997 by Jean-Pierre Jeunet
- Alien vs. Predator (film), fifth film in the franchise from 2004 by Paul W. S. Anderson
- Aliens vs. Predator: Requiem, sixth film in the franchise from 2007 by the Brothers Strause
- Prometheus (2012 film), seventh film in the franchise from 2012 by Ridley Scott
- Alien: Covenant, eighth film in the franchise from 2017 by Ridley Scott
- Alien: Romulus, ninth film in the franchise from 2024 by Fede Álvarez
- Alien 2: On Earth, a 1980 unofficial sequel of the 1979 Alien film
- Alien Visitor (also titled Epsilon) (1995 film) Australian–Italian science fiction film by Rolf de Heer
- The Alien (2016 film), a 2016 Mexican film
- The Alien (unproduced film), an incomplete 1960s Indian–American film
- Alienoid, a 2022 South Korean film
Literature
- Alien novels, an extension of the Alien franchise
- Aliens: Colonial Marines Technical Manual, a 1995 book by Lee Brimmicombe-Wood, a guide to the fictional United States Colonial Marines
- Aliens (Tappan Wright novel), a 1902 novel by Mary Tappan Wright
- Aliens! (anthology) a 1980 anthology of science fiction edited by Gardner Dozois and Jack Dann
- The Alien (novel), the eighth book in the Animorphs series by Katherine Applegate
- The Aliens (play), a 2010 play by Annie Baker
Music
Performers
- Alien (band), a 1980s Swedish rock group
- The Aliens (Australian band), a 1970s new wave group
- The Aliens (Scottish band), a 2005–2008 rock group
- The Aliens, the backing band for the American musician Jared Louche on his 1999 solo debut album Covergirl
Albums
- Alien (soundtrack), 1979
- Alien (Beam album), 2022
- Alien (Northlane album), 2019
- Alien (Strapping Young Lad album), 2005
- Alien, a 1989 EP by Tankard
- Aliens (soundtrack), 1987
Songs
- "Alien" (Britney Spears song), 2013
- "Alien" (Jonas Blue and Sabrina Carpenter song), 2018
- "Alien", a song by Atlanta Rhythm from the album Quinella, 1981
- "Alien", a song by Bush from the album Sixteen Stone, 1994
- "Alien", a song by Dead Letter Circus from the EP Dead Letter Circus, 2007
- "Alien", a song by The Devil Wears Prada from the EP Space, 2014
- "Alien", a song by Erasure from the album Loveboat, 2000
- "Alien", a song by Japan from the album Quiet Life, 1979
- "Alien", a song by Lamb from the album Fear of Fours, 1999
- "Alien", a song by Nerina Pallot from the album Dear Frustrated Superstar, 2001
- "Alien", a song by P-Model from the album Landsale, 1980
- "Alien", a song by Pennywise from the album Straight Ahead, 1999
- "Alien", a song by Stray Kids from the album SKZ-Replay, 2022
- "Alien", a song by Structures from the album Life Through a Window, 2014
- "Alien", a song by the National from the album First Two Pages of Frankenstein, 2023
- "Alien", a song by Third Day from the album Conspiracy No. 5, 1997
- "Alien", a song by Thriving Ivory from the album Thriving Ivory, 2003
- "Alien", a song by Tokio Hotel from the album Humanoid, 2009
- "Alien", a 2018 song by Beach House
- "Alien", a 2020 song by Lee Su-hyun
- "Alien", a 2020 song by Dennis Lloyd
- "Aliens" (song), a 2017 song by Coldplay
- "Aliens", a 1984 song by Warlord
- "The Alien", a song by Dream Theater from the album A View from the Top of the World, 2021
Video games
Based on the 1979 and 1986 films
- Alien (1982 video game), a 1982 maze game based on the 1979 film
- Alien (1984 video game), based on the 1979 film
- Aliens: The Computer Game (US Version), a 1986 game by Activision based on the 1986 film of the same name
- Aliens: The Computer Game (UK Version), a 1986 game by Electric Dreams based on the 1986 film
- Aliens (1990 video game), a game by Konami, based on the 1986 film
- Alien: Isolation, a 2014 video game based on the Alien science fiction horror film series
- See also: List of Alien, Predator, and Alien vs. Predator games
Other video games
- Aliens (1982 video game), a text-only clone of Space Invaders written for the CP/M operating system on the Kaypro computer
Other media
- Alien (Armenian TV series), a 2017 melodrama series
- Alien: Isolation – The Digital Series, web series in the Alien franchise from 2019 by Fabien Dubois
- Alien: Earth, an upcoming science fiction horror television series in the franchise by Noah Hawley
- Alien (sculpture), a 2012 work by David Breuer-Weil, in Mottisfont, Hampshire, England
- Aliens (Dark Horse Comics line)
- The Aliens (TV series), 2016 British sci-fi television series
- "Aliens" (Roseanne), a 1992 television episode
Other uses
- Alien (shipping company), a Russian company
- Alien Sun (born 1974), Singaporean actress
- Alien, a perfume by Thierry Mugler
- Alian District (Alien), in Taiwan
See also
- Alians, an Islamic order
- Alien Project (disambiguation)
- Alien 4 (disambiguation)
- Alien vs. Predator (disambiguation)
- Astrobiology, the study of hypothetical alien life
- ATLiens, a 1996 album by OutKast
- Predator (disambiguation)
- UFO (disambiguation)
- Unidentified flying object (disambiguation)
- Outsider (disambiguation)
- All pages with titles beginning with Alien
- All pages with titles containing Alien
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