| Acronym | Definition |
|---|
| EMS | Emergency Medical Service(s) |
| EMS | Eastern Mountain Sports |
| EMS | European Monetary System |
| EMS | European Mathematical Society |
| EMS | Electronics Manufacturing Services |
| EMS | Express Mail Service |
| EMS | Electronic Manufacturing Services |
| EMS | Environmental Management Systems (EU) |
| EMS | Energy Management Systems (Indianapolis, IN) |
| EMS | Emergency Medical System |
| EMS | Execution Management System |
| EMS | Energy Management System |
| EMS | Emergency Management Services |
| EMS | Engine Management System |
| EMS | Element Management System |
| EMS | Event Monitoring Service (Hewlett Packard) |
| EMS | Engineering and Manufacturing Services |
| EMS | Enhanced Messaging Service (wireless service) |
| EMS | Extra Mural Studies |
| EMS | Express Mail International (USPS) |
| EMS | Event Management System |
| EMS | Environmental Monitoring System |
| EMS | Earth and Mineral Sciences |
| EMS | Emergency Management System |
| EMS | Electromagnetic Spectrum |
| EMS | Eosinophilia Myalgia Syndrome |
| EMS | Expanded Memory Specification |
| EMS | Global Express Mail (USPS) |
| EMS | Enterprise Management System |
| EMS | European Meteorological Society |
| EMS | Établissements Médico-Sociaux |
| EMS | Essen Motor Show (Germany) |
| EMS | Environmental Media Services |
| EMS | Emergency Medical Support |
| EMS | Environmental Mutagen Society |
| EMS | Enterprise Message Service (trademark of TIBCO Software Inc.) |
| EMS | Extended Memory Specification |
| EMS | Electro-Muscle Stimulation |
| EMS | Enterprise Management Software |
| EMS | Engineering Management Society (IEEE) |
| EMS | Eastern Mennonite Seminary |
| EMS | Electromagnetic Susceptibility |
| EMS | Ethyl Methane Sulfonate |
| EMS | Event Management Systems |
| EMS | Equipment Maintenance Squadron |
| EMS | Electronic Mail System |
| EMS | Electronic Management System |
| EMS | Eat My Shorts |
| EMS | ElectroMagnetic Suspension |
| EMS | Eastern Middle School |
| EMS | Electronic Meeting Systems |
| EMS | Engine Monitoring System |
| EMS | Electronic Manufacturing Solutions |
| EMS | Electronic Mail Service |
| EMS | Emergency Messaging System |
| EMS | Electronic Message Service |
| EMS | Earth-Moon-Sun (sensors) |
| EMS | Education Management Systems (various organizations) |
| EMS | Electronic Marker System (3M) |
| EMS | Eignungstest für das Medizinstudium (German: Aptitude Test for Medical Studies; Switzerland and Austria) |
| EMS | Enterprise Messaging Service |
| EMS | Electron Momentum Spectroscopy |
| EMS | Enterprise Management Services |
| EMS | Evernham Motorsports |
| EMS | Economics and Management Science |
| EMS | Enforcement Management System |
| EMS | Electromagnetic Stirrer (metallurgy) |
| EMS | Electronic Message System |
| EMS | Electromechanical Services |
| EMS | Engineering Maintenance Services |
| EMS | English, Math and Science |
| EMS | Extended Memory System |
| EMS | E-Mail Shorthand |
| EMS | Extra-Marital Sex |
| EMS | Europe Maplestory (gaming) |
| EMS | Enquiry Management System |
| EMS | Executive Management Staff (employee performance forms) |
| EMS | Electronic Music Synthesis |
| EMS | Enterprise Messaging Server |
| EMS | Entitlement Management System |
| EMS | Efficient Market Services, Inc. |
| EMS | Eagleview Middle School |
| EMS | Engineering Music Society (The University of Melbourne, Australia) |
| EMS | Eastlake Middle School (Chula Vista, CA) |
| EMS | Enhanced Monitoring System |
| EMS | Exception Management System |
| EMS | Emergency Monitoring System |
| EMS | Enter, Mark, Spend (motto of Where's George) |
| EMS | Electromagnetic Science |
| EMS | European Mobile System |
| EMS | Emission Modeling System |
| EMS | Electromagnetic Static |
| EMS | Earl Marriott Secondary (school) |
| EMS | Excess Mileage Surcharge (airlines) |
| EMS | Equipment Maintenance & Supplies |
| EMS | Early Morning Seminary |
| EMS | European Macro Seismic Scale |
| EMS | Electrical Muscle Stimulation unit |
| EMS | Expert Monitoring System (fraud management; MasterCard) |
| EMS | Error Management System |
| EMS | Environmental Modeling and Software |
| EMS | Engineering Modeling Software |
| EMS | Engineering Mathematics and Statistics |
| EMS | Electromagnetic Surveillance |
| EMS | European Mariculture Society |
| EMS | Engineered Mechanical Systems, Inc (Westville, NJ) |
| EMS | Exchange Messaging Service |
| EMS | Equipment Management Section |
| EMS | Extended Manufacturing Services |
| EMS | Espion Monitoring Service |
| EMS | Eligibility Management Systems |
| EMS | Electronic Maintenance Shop |
| EMS | Extended Min-Sum |
| EMS | Environmental Measurement Sonde |
| EMS | Entertainment Management System |
| EMS | Enfinity Multisite (webshop application) |
| EMS | Electric Motor Servicenter |
| EMS | Elektromagnetische Schwebetechnik (German: magnetic leviation technique) |
| EMS | Emergency Mission Support |
| EMS | Educational Microcomputer Technology |
| EMS | ECMOP Modular System |
| EMS | Engineering Master Schedule/Services |
| EMS | Equipment Maintenance Standard |
| EMS | Electronic Maintenance Section |
| EMS | Experimental Mind State (band) |
| EMS | Electro Mono-rail System (automotive industry) |
| EMS | Electronic Master Schedule |
| EMS | Embedded Memory System |
| EMS | Equipment Management Station (Ciena) |
| EMS | Earthmoving Simulator |
| EMS | Experimental Monitoring Satellite |
| EMS | Environmental Monitoring Society (India) |
| EMS | Edmondson Mechanical Services Ltd. |
| EMS | Engineered Methods & Standards |
| EMS | Euro-Modular System (road freight transport) |
| EMS | Exchange Management Shell (software) |
| EMS | Environmental Monitoring Solutions (various locations) |
| EMS | Expense Management Solution (corporate compliance) |
| EMS | Effective Management Solutions (McKean, PA) |
| EMS | Engineering, Mathematics and Science (various schools) |
| EMS | Early Morning Stiffness |
| EMS | External Media Shield (software) |
| EMS | Event Marketing Solutions (various locations) |
| EMS | Electric Motor Sales (various locations) |
| EMS | Education Management Service (various organizations) |
| EMS | Elementary Middle School (various locations) |