| Acronym | Definition | 
|---|
| MES➣2-(N-Morpholino)ethanesulfonic Acid | 
| MES➣Manufacturing Execution Systems | 
| MES➣Metabolic Syndrome | 
| MES➣Mis En Scene (film terminology) | 
| MES➣Mechanical Engineering Services (various locations) | 
| MES➣Management and Engineering Services | 
| MES➣Ministry of Emergency Situations (various locations) | 
| MES➣Medical Equipment Service (various locations) | 
| MES➣Monitoring and Evaluation System | 
| MES➣Mitsui Engineering & Shipbuilding (Japan) | 
| MES➣Managed Ethernet Switch | 
| MES➣Ministère de l'Emploi et de la Solidarité (French: Department of Employment and Solidarity; various locations) | 
| MES➣Matières En Suspension (French) | 
| MES➣Middle East Section (various organizations) | 
| MES➣Medical Equipment Services (various locations) | 
| MES➣Musical Ear Syndrome (auditory hallucinations) | 
| MES➣Mclaren Electronic System | 
| MES➣Mobile Education System | 
| MES➣Macromedia Enterprise Server | 
| MES➣Mobile Enterprise Server | 
| MES➣Mcat Enabled Server | 
| MES➣Management Elements | 
| MES➣Managed Ethernet Service | 
| MES➣Mobile Enterprise Suite | 
| MES➣Manufacturing Execution System | 
| MES➣Miscellaneous Equipment Specification | 
| MES➣Message System | 
| MES➣Microsoft Exchange Server | 
| MES➣Mazda Europe Service | 
| MES➣Micro Engineering Solutions | 
| MES➣Manufacturing Extension Systems | 
| MES➣Master in European Studies (various schools) | 
| MES➣Mark E. Smith (UK musician) | 
| MES➣Markets for Ecosystem Services (environmental approach) | 
| MES➣Magnolia Elementary School (various locations) | 
| MES➣Minimum Efficient Scale (economics) | 
| MES➣McMaster Engineering Society (McMaster University; Hamilton, Ontario, Canada) | 
| MES➣Multibeam Echo Sounder (oceanography) | 
| MES➣Microsoft Enterprise Services (software) | 
| MES➣Master of Environmental Studies (degree) | 
| MES➣Main English Speaking (Australia) | 
| MES➣Methanesulfonic Acid | 
| MES➣Mobile Earth Station (INMARSAT) | 
| MES➣Microembolic Signals (transcranial doppler monitoring) | 
| MES➣Military Engineering Services | 
| MES➣Marconi Electronic Systems | 
| MES➣Muslim Educational Society | 
| MES➣Maximal Electroshock Seizure (test) | 
| MES➣Meeting and Event Services (various organizations) | 
| MES➣Medical Ethics Society (various organizations) | 
| MES➣Marine Evacuation System | 
| MES➣Malheur Experiment Station (Oregon State University) | 
| MES➣Medical Education Summit | 
| MES➣Ministério do Equipamento Social (Portuguese Ministry for the Social Equipment) | 
| MES➣Microsoft Exchange System | 
| MES➣Medical Equipment Sets | 
| MES➣Master of Environmental Science (degree) | 
| MES➣Main Engine Start | 
| MES➣Mobile End System | 
| MES➣Manual Encoding Station (baggage) | 
| MES➣McMaster Economics Society (McMaster University; Hamilton, Ontario, Canada) | 
| MES➣Master Earth Station | 
| MES➣Miniature Edison Screw (type of cap on electric bulb) | 
| MES➣Media, Entertainment and Sports Club (various universities) | 
| MES➣Medan, Indonesia - Polonia (Airport Code) | 
| MES➣Money Ethic Scale | 
| MES➣Museum of Earth Sciences (various locations) | 
| MES➣Multimedia Emergency Session | 
| MES➣Marketable Equity Securities | 
| MES➣Metro Ethernet Services | 
| MES➣Mississippi Engineering Society | 
| MES➣Mechanical Engineering Solutions (various locations) | 
| MES➣Malaysian Endodontic Society | 
| MES➣Mesquite Elementary School (various locations) | 
| MES➣Mitered End Section | 
| MES➣Miscellaneous Equipment Specifications | 
| MES➣Maintenance Engineering System | 
| MES➣Mine Effects Simulator | 
| MES➣Mossbauer Emission Spectroscopy | 
| MES➣Minister for Environment and Science | 
| MES➣Manawatu Evening Standard (New Zealand newspaper) | 
| MES➣Magnetischer Eigenschutz (German; magnetic self-protection; degaussing device) | 
| MES➣Medical Expense Statement | 
| MES➣Measurement Evaluation System (semiconductors) | 
| MES➣Minimum Efficient Firm Size | 
| MES➣Medium-Energy Source | 
| MES➣Mission Electronic System | 
| MES➣Management Engineering Squadron | 
| MES➣Maple Equipment Specialists | 
| MES➣Microfilm Exposure System | 
| MES➣Mechanical Event Simulator | 
| MES➣Message Entry System | 
| MES➣Missing Entire Statement (software fault) | 
| MES➣Multilateral Education System | 
| MES➣Military Essentiality Status | 
| MES➣Mines Effects Simulation | 
| MES➣Medium Errored Second (31-320 errors/second) | 
| MES➣Motor End Support | 
| MES➣Metro Edge Switch |