MTU may refer to:
Networks and Internet
- Maximum transmission unit, the size of the largest packet that a network protocol can transmit
Aeronautics
- Motoren- und Turbinen-Union, a former German engine manufacturer, now MTU Aero Engines and MTU Friedrichshafen
- MTU Aero Engines, a German aircraft engine manufacturer
- MTU Friedrichshafen, a former division of DaimlerChrysler
Education
- Michigan Technological University, an American public university
- Mahamaya Technical University, an Indian public university
- Mandalay Technological University, a Burmese public university
Other
- Mitsubishi UFJ Financial Group, New York Stock Exchange symbol MTU
- Metric Ton(ne) Unit
- Marvel Team-Up, a title from Marvel Comics
- Miss Thailand Universe, a beauty pageant in Thailand
- Miss Teen USA, a beauty pageant for American girls 14-18