TMU can refer to:
- Tambor Airport, in Costa Rica (IATA code)
- TrackMania United, a combined arcade racing game
- Texture mapping unit, a component in modern computer graphics processing units
- Taipei Medical University, Taipei City, Taiwan
- Tarbiat Modares University, Tehran, Iran
- Tarbiat Moallem University, Tehran, Iran
- Tokyo Medical University, Japan
- Tokyo Metropolitan University, Japan
- Time Measurement Unit (0.036 seconds), used in various predetermined motion time systems
- Texas Methodist University, a fictional university on TV show Friday Night Lights
- Tmu, chief Egyptian god of Annu.