| Acronym | Definition |
|---|
| MU | Mauritius |
| MU | Oman (Including Kuriamuriais) |
| MU | Musician (US Navy rating) |
| MU | Manchester United |
| MU | Makeup |
| MU | Mansfield University (Mansfield, PA) |
| MU | University of Missouri-Columbia |
| MU | Miss You |
| MU | Marvel Universe (comics) |
| MU | Marquette University (Milwaukee, WI) |
| MU | Marshall University (Huntington, WV) |
| MU | Miami University (Oxford, OH, USA) |
| MU | China Eastern Airlines |
| MU | Millersville University (Millersville, PA, USA) |
| MU | Monmouth University |
| MU | Memorial Union |
| MU | McGill University (Montreal, Canada) |
| MU | Multiple Unit |
| MU | Match Up |
| MU | Memory Unit |
| MU | Mothers' Union |
| MU | Marymount University (Arlington, VA) |
| MU | Mercer University (Macon, GA) |
| MU | Madonna University (Michigan) |
| MU | Mark Up |
| MU | Million Units (M Units) |
| MU | Management Unit |
| MU | Mothers Union |
| MU | Mutual Understanding |
| MU | Melbourne University (Australia) |
| MU | Mahidol University (Thailand) |
| MU | Motor Unit |
| MU | Mount Union College |
| MU | Measurement Uncertainty (gage repeatablity and reproducibility study and in quality-field) |
| MU | Massey University (New Zealand) |
| MU | Mobile Unit (mobile wireless device) |
| MU | Monitor Unit |
| MU | Marginal Utility |
| MU | Monetary Unit |
| MU | Mobile Unit (US Army) |
| MU | Mumbai University (India) |
| MU | Mekelle University (Ethiopia) |
| MU | Modules Used |
| MU | Marmara University (Turkey) |
| MU | Musician's Union |
| MU | Mugla University (Turkey) |
| MU | Middle and Upper Atmosphere |
| MU | Milwaukee University |
| MU | Mounted Unit (police) |
| MU | Minimum Unit |
| MU | Mouse Unit (biological measure of toxicity) |
| MU | Memo of Understanding |
| MU | Modelo de Utilidade (Utility Model, Brazil) |
| MU | Malayan Union |
| MU | Mogadishu University (Somalia) |
| MU | Miners Union |
| MU | Misamis University |
| MU | Movimiento de Unidad (Spanish: Unity Movement) |
| MU | Message Utilities |
| MU | Music Applied |
| MU | Ministerial Understanding |
| MU | Microwave Unit |
| MU | Multiplexing Unit |