Miasma may refer to:
- Miasma (Ancient Greek religion), a contagious power that has an independent life of its own
Medicine
- Miasma theory, an obsolete medical theory that held that diseases were caused by a noxious form of "bad air"
- Miasm, an "infectious principle" underlying chronic disease and "peculiar morbid derangement of vital force"
Music
- Miasma (album), a 2005 album by the Black Dahlia Murder
- Miasma (EP), a 2001 EP by Hecate Enthroned
- Miasma, a 1987 album by the Bevis Frond
- "Miasma" (Ghost song), 2018
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