Alien

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) AustralianItalian science fiction film by Rolf de Heer
 * The Alien (2016 film), a 2016 Mexican film
 * The Alien (unproduced film), an incomplete 1960s IndianAmerican 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

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 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

 * Alien (1982 video game), a 1982 maze game based on the 1979 film
 * Alien (1984 video game), based on the film
 * Aliens (1990 video game), a game by Konami, based on the sequel of the film
 * Alien: Isolation, a 2014 video game based on the Alien science fiction horror film series
 * Aliens (1982 video game), a text-only clone of Space Invaders written for the CP/M operating system on the Kaypro computer
 * 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