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Look up harmonium in Wiktionary, the free dictionary.
A harmonium or pump organ is a reed organ that generates sound with foot- or hand-pumped bellows.
Harmonium may also refer to:
- Harmonium (fictional creature), a creature in the 1959 novel The Sirens of Titan
- Harmonium (poetry collection), a 1923 collection of poetry by Wallace Stevens
- Hooke's atom or harmonium, an artificial helium-like atom
- Former name for a restricted Boltzmann machine, a generative stochastic neural network
- The earliest ringtone maker, released in 1997
- Harmonium (film), a 2016 Japanese film