or '''Aliens''' may mean:
- Extraterrestrial Life , in scientific context
- Extraterrestrial Life In Culture
- Alien fictional universe:
- --- ''Alien'' (1979 film), by Ridley Scott
- --- ''Aliens'' (1986 film), the sequel to the above film
- --- ''Alien³'' (1992 film), the third ''Alien'' movie
- --- (1997 film), the fourth ''Alien'' movie
- --- '' Alien Vs. Predator '' (2004 film), also a comic book series, novel series, and video game series
- --- Xenomorph (Alien) , the alien creatures from the ''Alien'' movies
- --- Aliens (comic) , a group of comic book series
- Alien (biology) , a non-native species
- Alien (computing) , a program that converts between different Linux package distribution file formats
- Alien (law) , in the US, a person who is neither a native nor a citizen of their country of residence (this term is not used outside the US for people from another country)
- --- Resident Alien - an ''alien'' (foreign national) in legal residence in another country
- --- Illegal Alien - an ''alien'' (foreign national) who did not legally enter another country
- --- Enemy Alien - an ''alien'' (foreign national) whose country is at war with the country they reside in
- Alien (signifier) , use in literature and criticism as the embodiment of an outside perspective or the sense of the other
- The Aliens , Roky Erickson's backing band
- Alien (game) , a 1982 DOS text adventure
- Aliens (album) , an album by Irish Celtic Rock band Horslips
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