Harmonia is the name of planets in multiple works of science fiction:
- Harmonia - Robert Sheckley's Options
- Harmonia 7 –“Aliens, Guns and A Monkey,” Tripping the Rift, Season 1
- Harmonious Repose - Vernor Vinge's A Fire Upon the Deep
- Harmony - Spider Robinson's Callahan's Key, p. 101
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