Miasma may refer to:
- The recurring storyline element.
- The recurring enemy ability.
- The HP-draining effect in the Labyrinth of Time in Final Fantasy.
- The HP-draining effect in the Arcane Labyrinth in Final Fantasy II.
- The weather in Final Fantasy XI.
Early medical theories predating the discovery of microorganisms often associating foul air, called miasma, from crowded conditions or rotten objects as a cause of disease.