GMU may refer to:
- Gaelic medium unit (in Scottish education)
- George Mason University, in Virginia, United States
- Georgian Mathematical Union
- IATA Airport Code for Greenville Downtown Airport, in South Carolina, United States
- Guangzhou Medical University, in China
- Guarded Memory Unit, a feature in Intel i960
- Guglielmo Marconi University, in Italy
- Guizhou Medical University, in China
- Gulf Medical University, in the UAE
- ISO language code for Gumalu language
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