MMU
- Manchester Metropolitan University
- Manned Maneuvering Unit
- Marymount University
- Mega Man Universe
- Memory management unit
- Milli mass unit
- Mobile Meteorological Unit
- Morristown Municipal Airport
- Mount Mansfield Union High School
- Mount Meru University
- Mountains of the Moon University
- Multimedia University
- Myanmar Maritime University
- TAI TF Kaan