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
- Adventive plants or alien plants, species that are foreign to the native flora

Alien(s) or The Alien(s) may also refer to:

Arts and entertainment

Alien (franchise), a media franchise
- Xenomorph, the titular alien in the franchise

Alien (film), a 1979 film by Ridley Scott
- Alien 3, third film in the franchise from 1992 by David Fincher
- Alien: Covenant, eighth film in the franchise from 2017 by Ridley Scott
- Alien Resurrection, fourth film in the franchise from 1997 by Jean-Pierre Jeunet
- Alien: Romulus, ninth film in the franchise from 2024 by Fede Álvarez
- Alien vs. Predator (film), fifth film in the franchise from 2004 by Paul W. S. Anderson
- Aliens (film), second film in the franchise from 1986 by James Cameron
- Aliens vs. Predator: Requiem, sixth film in the franchise from 2007 by the Brothers Strause
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
Alienoid, a 2022 South Korean film
The Alien (2016 film), a 2016 Mexican film
The Alien (unproduced film), an incomplete 1960s Indian–American film

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

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

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

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