Illegal Alien

Illegal Alien or Illegal Aliens may refer to:

• Alien (law), legal concept of aliens
• Illegal alien, the statutory and legal term used in some countries for an illegal immigrant or other unauthorized resident
• Illegal aliens (Library of Congress Subject Heading), replaced with the heading "Noncitizens" in 2021
• Enemy alien

Entertainment

• Illegal Aliens (film), a 2007 film starring Anna Nicole Smith and Chyna
• Illegal Aliens (novel), a 1989 science fiction novel by Nick Pollotta and Phil Foglio
• Illegal Alien (Sawyer novel), a 1997 science fiction novel by Robert J. Sawyer
• Illegal Alien (Tucker and Perry novel), a 1997 Doctor Who novel by Mike Tucker & Robert Perry
• Illegal Alien, a graphic novel by James Robinson
• "Illegal Alien" (song), a track on the album Genesis by Genesis (1983)
• "Illegal Aliens" (My Hero), a 2005 television episode