Chaos or CHAOS may refer to:

• Chaos: Making a New Science, a 1987 book by James Gleick
• Chaos (company), a Bulgarian rendering and simulation software company
• Chaos (genus), a genus of amoebae
• Chaos (journal), a scientific journal devoted to nonlinear systems
• Chaos (malware), a malware that infects Windows, Linux, and FreeBSD devices
• Chaos (mathematics), an interdisciplinary area of science and mathematics
• Chaos (operating system), a Linux distribution
• Chaos (physics), a branch of quantum physics
• 19521 Chaos, an object in space

• Chaos, a season in the Discordian calendar
• Chaos (cosmogony), in the Greek creation myths
• Chaos magic, a contemporary magical practice
• Liber Chaos, an philosopical treatise by Ramon Llull

• Chaos (Kinnikuman)
• Chaos (Sailor Moon)
• Chaos (Sesame Park)
• Chaos (Warhammer)
• Chaos, in Fabula Nova Crystallis Final Fantasy
• Chaos, in King of Cards (manga)
• Chaos, in Loom (video game)
• Chaos, in The Power of Five
• Chaos, in The Seven Deadly Sins (manga)
• Chaos, in Sonic the Hedgehog series
• Chaos, in Xenosaga
• Symbol of Chaos, a symbol in Michael Moorcock's Elric of Melniboné stories

• Chaos (2000 film), a Japanese mystery-thriller
• Chaos (2001 film), a French comedy-drama
• Chaos (2005 action film), an action thriller
• Chaos (2005 horror film), an American horror film
• Chaos, a 2006 Polish film directed by Xawery Zulawski
• Chaos (2008 film), a Hong Kong action thriller
• Chaos: The Manson Murders, a 2025 American documentary film
• Kaos (film) (Chaos in the U.S.), a 1984 Italian film
• Le Chaos, a 2007 Arabic-language film
• CHAOS (TV series), 2011
• "Chaos" (The Good Fight), a 2017 television episode
• "Chaos" (Spaced), a 1999 television episode
• "Chaos", an episode of the Indian TV series The Suite Life of Karan & Kabir
• "Chaos", a 1986 episode of The Transformers

• Chaos: Charles Manson, the CIA, and the Secret History of the Sixties, a 2019 book by Tom O'Neill with Dan Piepenbring
• Chaos, a 2016 novel by Patricia Cornwell
• Chaos, an 1898 novel by Alexander Shirvanzade
• "The Chaos", a poem by Gerard Nolst Trenité

• Chaos (Attila album), 2016
• Chaos - Part 1 and Part 2, a 1958 novelty 45 RPM record by Stanley Ralph Ross and Bob Arbogast
• Chaos (Paul Bley album), 1998
• The Chaos (album), by The Futureheads, 2010
• Chaos, an album by Rene Aubry, 2017
• Chaos, an album by Jaycee Chan, 2010
• Chaos, an album by Unlocking the Truth, 2016
• "CHAOS", a song by VIXX from the 2013 EP Hyde
• "Chaos", a 2007 song by Mutemath
• "Chaos", a song by Unkle from the 1998 album Psyence Fiction
• "Chaos", a song by Tim Sköld from the 1996 album Skold
• "Chaos", a song by Stump from the 1988 album A Fierce Pancake
• Chaos, an album by Josh A & iamjakehill, 2018
• Casey Chaos (1965–2024), American musician

• Chaos, a cultural festival of the Indian Institute of Management, Ahmedabad
• Chaos: The Battle of Wizards, a 1985 video game
• Chaos! Comics, a comic book publisher (1994–2002)

• Chaos Reef, in the South Shetland Islands, Antarctica
• Mount Chaos, a mountain in New Zealand

• Chaos (professional wrestling), a professional wrestling alliance
• Chaos (roller coaster), in Nashville, Tennessee, U.S.
• Chaos.com, an Australian online retailer
• Operation CHAOS, a CIA domestic espionage project
• Rans S-9 Chaos, an American aerobatic aircraft design

• All pages with titles beginning with Chaos
• All pages with titles containing Chaos
• Chao (disambiguation)
• Community Health Analytics Open Source Software (CHAOSS)
• Chaos Theory (disambiguation)
• KAOS (disambiguation)
• k-os (born 1972), a Canadian rapper
• New World Disorder (disambiguation)
• XaoS, an interactive fractal zoomer program
• Willy-nilly (idiom), an idiom and slang term that pertains to chaos