XXX may refer to:
- The number 30 in Roman numerals
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- Games of the XXX Olympiad
- A mark indicating "extra strong"
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- Alcoholic beverages
- Pornography
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- XXX, a type of X rating applied to some pornographic films
- .xxx, a top-level domain intended as a voluntary option for sexually explicit sites on the Internet
- A warning or danger signal, or symbol for doubtful/unknown
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- XXX, an indication of urgency in radio communication, less urgent than SOS
- XXX, a comment to warn other programmers of problematic or misleading code
- XXX, the code for "no currency" in ISO 4217
- XXX, the code for "unspecified nationality" on a machine-readable passport
- Television, film, music and literature:
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- xXx, a 2002 action film starring Vin Diesel
- xXx: State of the Union, the 2005 sequel starring Ice Cube
- xXx: The Return of Xander Cage, a planned sequel of xXx starring Vin Diesel.
- XXX (ZZ Top album), a 1999 album by the rock band ZZ Top
- XXX (Danny Brown album), a 2011 album by rapper Danny Brown
- XXX (Asia album), a 2012 album by the band Asia
- X X X, a 2011 single by Japanese band L'Arc en Ciel
- XXX: Exklusibong, Explosibong, Exposé, a Philippine current affairs television show
- Anya Amasova or Agent XXX, a character in the James Bond franchise
- xXx, a 2002 action film starring Vin Diesel
- And also:
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- A symbol of the straight edge lifestyle
- A shortened version of "XXXL", a plus size clothing size
- A reference to Amsterdam, after the three crosses on the Coat of arms of Amsterdam
- A flavor of Vitamin Water
- Triple X syndrome chromosomal variation, often referred to as 47,XXX