| MSU | Major Subordinate Unit 
| Others |
| MSU | Make Stuff Up
| Others |
| MSU | Makes Sh*t Up
| Others |
| MSU | Making Sh*t Up
| Others |
| MSU | Malaysian Students Union
| Others |
| MSU | Management & Science University (Shah Alam, Selangor, Malaysia)
| Others |
| MSU | Maple Syrup Urine
| Others |
| MSU | Market Segment Understandings
| Others |
| MSU | Mass Storage Unit
| Others |
| MSU | McMaster Student Union
| Others |
| MSU | McNeese State University
| Others |
| MSU | Measuring Stimuli Units
| Others |
| MSU | Medical Statistics Unit
| Others |
| MSU | Medical/Surgical Unit
| Others |
| MSU | Mediocre State University
| Others |
| MSU | Medium Security Unit
| Others |
| MSU | Men's Striped Underwear
| Others |
| MSU | Mentoring, Supporting, and Understanding
| Others |
| MSU | Message Signal Unit
| Others |
| MSU | Message Signal Units
| Others |
| MSU | Metropolitan State University
| Others |
| MSU | Metropolitan State University of Denver (Colorado)
| Others |
| MSU | Miaka Sites United
| Others |
| MSU | Michigan State
| Others |
| MSU | Michigan State University
| Others |
| MSU | Michigan State Universityrsity
| Others |
| MSU | Micro-Static Unit
| Others |
| MSU | Microsoft Software Update
| Others |
| MSU | Microsoft Standalone Update
| Others |
| MSU | Microsoft University
| Others |
| MSU | Microwave Sounding Unit
| Others |
| MSU | Mid Size Suv
| Others |
| MSU | Mid Stream Urination
| Others |
| MSU | Mid stream urine
| Others |
| MSU | Midstream Specimen of Urine
| Others |
| MSU | MidStream Urine
| Others |
| MSU | Midwestern State University
| Others |
| MSU | Mighty Sad University
| Others |
| MSU | Million Service Units
| Others |
| MSU | Millions of Service Units
| Others |
| MSU | Minimum Security Unit
| Others |
| MSU | Minimum Settlement Unit
| Others |
| MSU | Minnesota State University
| Others |
| MSU | Minot State University
| Others |
| MSU | Misery State University
| Others |
| MSU | Mississippi State University
| Others |
| MSU | Mobile Service Unit
| Others |
| MSU | Mobile Street Unit
| Others |
| MSU | Mobile Stroke Unit
| Others |
| MSU | Mobile Surgical Unit
| Others |
| MSU | Mode Selector Unit
| Others |
| MSU | Modem Sharing Unit
| Others |
| MSU | Modular Sorting Unit
| Others |
| MSU | Monitored Stroke Unit
| Others |
| MSU | MonoSodium Urate
| Others |
| MSU | Montana State University
| Others |
| MSU | Montclair State University
| Others |
| MSU | Monthly Summaries Untrimmed
| Others |
| MSU | Morehead State University
| Others |
| MSU | Morgan State University
| Others |
| MSU | Moscow State University
| Others |
| MSU | Most Stupidest Universty
| Others |
| MSU | Mostly Socialist University
| Others |
| MSU | Moving and Storage University
| Others |
| MSU | MSU Stands for Unit
| Others |
| MSU | Mu Sigma Upsilon
| Others |
| MSU | Multi Service Unit
| Others |
| MSU | Multi Speaker Unit
| Others |
| MSU | Multi system UK
| Others |
| MSU | Multiple School Unit
| Others |
| MSU | Multiple Scoring Units
| Others |
| MSU | Multiple Small Units
| Others |
| MSU | Mushroom Society of Utah
| Others |
| MSU | Muslim Student Union
| Others |
| MSU | Myocardial Substrate Uptake
| Others |