Chaos may refer to:
- The character from the original Final Fantasy.
- The item from Final Fantasy VII.
- The ability from Final Fantasy VII.
- Vincent Valentine's transformation from Compilation of Final Fantasy VII.
- The enemy ability from Final Fantasy X.
- The ability from Final Fantasy Tactics.
- The storyline element from Final Fantasy XIII-2 and Lightning Returns: Final Fantasy XIII.
- The ability from Final Fantasy XIII-2.
- The status from Final Fantasy XIV.
- The character from Final Fantasy Legend III.
- The entity, represented by Earl Tyrant, from Final Fantasy: Unlimited.
- The character from Final Fantasy: The 4 Heroes of Light.
- The ability from Final Fantasy Airborne Brigade.
- The boss from Final Fantasy All the Bravest.
- The boss from Final Fantasy Record Keeper.
- The character from Mobius Final Fantasy.
- The Dark Knight ability from Final Fantasy Fables: Chocobo Tales.
- The rule for Triple Triad from Final Fantasy Portal App.
Chaos refers to the void state preceding the creation of the universe in Greek creation myths, or to the initial "gap" created by the original separation of heaven and earth. Chaos also refers to a state of disorder, disharmony, dissonance, lawlessness, and unpredictability.