may refer to:
- Alien (film Series) :
- --- ''Alien'' (film) (1979 film), by Ridley Scott, which in turn inspired the following related works:
- --- ''Aliens'' (film) (1986 film), the sequel to the 1979 film.
- --- '' Alien³ '' (1992 film), the third ''Alien'' movie.
- --- '''' (1997 film), the fourth ''Alien'' movie.
- --- '' Alien Vs. Predator '' a film series, a comic book series, novel series, and video game series.
- --- Xenomorph (Alien) , the alien creatures from the ''Alien'' movies.
- --- ''Aliens'' (comic Book) , a group of comic book series.
- --- ''Alien'' (video Game) , an early home computer game based on the first film.
- , an episode of ''Law & Order: Special Victims Unit''
- '' The Alien '', a cancelled film with a script by Satyajit Ray.
- Svešais ( English : Alien) (1988 film)
- 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.
- Alien (signifier) , use in literature and criticism as the embodiment of an outside perspective or the sense of the other.
- Alien Technology , a maker of UHF RFID tags.
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