Organ may refer to:
- Organ (anatomy), a group of tissues which perform some function.
- Organ (music), a family of keyboard instruments which is usually played with both the hands and the feet.
- The Organ, an indie rock band.
- Stalin's Organ, another name for the Katyusha rocket launcher.
- In warfare, a 17th century historical artillery design, resembling the appearance of the musical instrument.
- In politics, an agency, institution, council, or parliament of a given organization, such as the European Union, United Nations, or African Union.
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