Chaos may refer to:
- Chaos, the main villain from Sonic Adventure.
- Chaos Chao, a special breed of Chao.
- Chaos Devil, a creation of Doctor Wily and Eggman in the archie comics.
- Chaos Gamma, a character in Sonic Battle.
- Chaos Knuckles, a transformation of Knuckles the Echidna in the Archie Comics.
- Chaos Shadow, a transformation of Shadow the Hedgehog in the Archie Comics.
- Chaosbot, a robot who appeared in the Sonic X comic.
- Chaos Powers
- Chaos Angel, a level in Sonic Advance 3.
- Chaos Cannon, a weapon made by the Dark Legion.
- Chaos City, a location in the Adventures of Sonic the Hedgehog.
- Chaos Control Freaks, an episode of Sonic X.
- Chaos Drives, objects used for Chao.
- Chaos energy
- Chaos Force
- Chaos Orb, an item used to gain XP.
- Chaos Ring, items collected in Knuckles' Chaotix.
- Chaos Siphon Suit, a suit made to control Chaos Knuckles.
- Chaos Syphon, an invention made by Dimitri.