Illegal aliens may refer to:

• Illegal immigration
• Illegal Aliens (film), a 2007 film starring Anna Nicole Smith and Chyna
• Illegal Alien (film), a film based on the life of Akon
• Illegal Alien (novel), a 1997 science fiction novel by Robert J Sawyer
• Illegal Aliens (novel), a 1989 science fiction novel by Nick Pollotta and Phil Foglio
• "Illegal Alien" (song), the 5th track in the 1983 album Genesis by Genesis

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