Alien (film) (1979 film), by Ridley Scott, which in turn inspired the following related works:

Svešais (English: Alien) (1988 film)

Extraterrestrial life, in scientific context.

Aliens (film) (1986 film), the sequel to the 1979 film.

Xenomorph (Alien), the alien creatures from the Alien movies.

Alien (film series):

Aliens vs. Predator: Requiem the second film in the Alien vs. Predator series (sixth in the Alien series)

Alien³ (1992 film), the third Alien movie.

Aliens (album), the album by Irish celtic rock band Horslips.

Alien vs. Predator a film series, a comic book series, novel series, and video game series.

Aliens (comic book), a group of comic book series.

Alien: Resurrection (1997 film), the fourth Alien movie.

Alien Technology, a maker of UHF RFID tags.

"Alien" (Law & Order: Special Victims Unit), an episode of Law & Order: Special Victims Unit

Extraterrestrial life in popular culture

Atliens, a 1996 album by rap group OutKast.

Aliens (arcade game), a 1990 arcade shoot 'em up by Konami.

Aliens (novel series), a number of novels based on the series.

Alien (album), a 2005 album by metal project Strapping Young Lad.

The Alien, a cancelled film with a script by Satyajit Ray.

The Aliens, a funk band from Scotland.

Alien (law), owing political allegiance to another country or government. A person who is neither a native nor a citizen of the country of residence. Person refers both to humans, which US law calls individuals as well as corporations.

Alien (software), computer program that converts between different Linux package formats.

Alien (signifier), use in literature and criticism as the embodiment of an outside perspective or the sense of the other.

Aliens (video game), a number of video games.

Alienware Computer Corporation, a division of Dell.

AliEn (ALICE Environment), software/grid middleware used CERN.

The Aliens (reggae group), a 1970s vocal group from Jamaica whose members included Barry Brown and Rod Taylor

Alien (song), a 1999 song by Pennywise.

Alien (Third Day song), a 1997 song from Christian rock group Third Day.