| Acronym | Definition |
|---|
| ECS | Education Commission of the States (Denver, CO) |
| ECS | Elitegroup Computer Systems |
| ECS | Engineering and Computer Science |
| ECS | Electronics and Computer Science |
| ECS | Electrochemical Society |
| eCS | eComStation (operating system) |
| ECS | Environmental Control System |
| ECS | Episcopal Community Services (San Francisco, California) |
| ECS | Evangelical Christian School (Cordova, TN) |
| ECS | Export Control System |
| ECS | Early Childhood Services |
| ECS | EOSDIS Core System |
| ECS | Electronic Chart System |
| ECS | East Coast Swing (dance style) |
| ECS | Electronic Clearing System |
| ECS | Electroconvulsive Shock |
| ECS | Electronic Control System |
| ECS | Energy Control System |
| ECS | Enterprise Communications Server |
| ECS | Emission Control System |
| ECS | East China Sea |
| ECS | Enhanced Chip Set (Amiga) |
| ECS | Ecological Classification System |
| ECS | Episcopal Church of the Sudan |
| ECS | Electronic Commerce Services |
| ECS | Empty Coaching Stock (railway) |
| ECS | Electronic Charting Systems |
| ECS | Economy Class Syndrome (Deep Vein Thrombosis) |
| ECS | Event Correlation Services |
| ECS | European Communications Satellite |
| ECS | Expeditionary Combat Support |
| ECS | Electronic Claim Submission (insurance) |
| ECS | Engagement Control Station |
| ECS | Embedded Computer System |
| ECS | Elder Care Specialist |
| ECS | Electrical Control System |
| ECS | Earlham Computing Services |
| ECS | Eagle Creek Systems, Inc. |
| ECS | Entertainment Computer System (Intellivision video game system) |
| ECS | Ellensburg Christian School |
| ECS | Eberron Campaign Setting (roleplaying games, Dungeons & Dragons) |
| ECS | Extended Character Set |
| ECS | Electronic Customer Support |
| ECS | Electronic Communications System |
| ECS | Electronic Combat Squadron |
| ECS | Equipment Concentration Site |
| ECS | Engineering Control System |
| ECS | Engineering & Computer Simulations, Inc (Orlando, Florida) |
| ECS | Expeditionary Communications Squadron |
| ECS | Extended Core Storage |
| ECS | Entertainment Computing Symposium |
| ECS | Equilibrium Crystal Shape |
| ECS | Empire of Chivalry and Steel (Middle Ages historical interpretation organization) |
| ECS | Empire City Subway |
| ECS | Encarta Class Server (Microsoft) |
| ECS | Entry Control System |
| ECS | Electronic Cloaking System (Full Metal Panic! reference; Japanese animation) |
| ECS | Emergency Calling Service (911 emergency service in SS7 documentation) |
| ECS | Encryption Control Signal |
| ECS | Employee Consultation Service |
| ECS | Electronic Customer Service |
| ECS | Extra Cash Systems (website) |
| ECS | Egyptian Commercial Service (Egyptian Ministry of Trade and Industry) |
| ECS | Electronic Cash Systems, Inc. |
| ECS | Evansville Christian School (Evansville, IN) |
| ECS | Emergency Communications Staff |
| ECS | Exterior Communications System |
| ECS | Estate Computer Systems LTD |
| ECS | Electronics, Controls, and Software (automobile engineering) |
| ECS | Enterprise Communication System |
| ECS | Emergency Cooling System |
| ECS | Exchange Conferencing Server (Microsoft) |
| ECS | Electrical Charging System |
| ECS | Exact Coherent States (physics) |
| ECS | Electro-Chemical Sensor |
| ECS | Energy Conversion Subsystem |
| ECS | Executive Control System |
| ECS | Etherington Conservation Services (Greensboro, North Carolina) |
| ECS | Essential Care Skills (St John Ambulance, UK) |
| ECS | Emergency Control Station |
| ECS | Exercise Control System |
| ECS | Engineering Change Support |
| ECS | Electronic Consult System |
| ECS | Enhanced Control Server (Lucent) |
| ECS | Exercise Control Squadron |
| ECS | Elitegroup Computer Services |
| ECS | Emergency Collaboration System (Forum Communications International) |
| ECS | Electronic Cross-connect System (Sprint) |
| ECS | Evansville Chrysler Sunbeam (ammunition headstamp) |
| eCS | E-Catalog Suite |
| ECS | European Center of Study (Italy) |
| ECS | Extended Campus Service |
| ECS | Extended Customer Service |
| ECS | Event Correlation Subsystem |
| ECS | Electronic Countersurveillance |
| ECS | Eastern Computer Services, Incorporated |
| ECS | Effects Coordination System |
| ECS | Encapsulated Coordinate System |
| ECS | Electrabel Customer Solution |
| ECS | Enhanced Comfort System (Thomasville furniture) |
| ECS | Exchange Carrier Standard |
| ECS | Event Communications Service(s) |
| ECS | Experimental Control System/Station |
| ECS | Executive Control Subsystem |
| ECS | Enhanced Chukka Shoe (Navy Boondocker) |
| ECS | Enterprise Commerce Solutions |
| ECS | Excitation Compounding Scheme |
| ECS | Ethernet Communications Server (Sprint) |
| ECS | Estonian Cancer Society |
| ECS | Early Childhood Screening (various organizations) |
| ECS | Energy Charter Secretariat (Energy Charter Treaty) |
| ECS | Educational Career Services |
| ECS | Expert Consulting Service (various organizations) |
| ECS | Express Computer Service (various locations) |
| ECS | Employment Career Services (various schools) |
| ECS | Education, Community and Society (UK) |
| ECS | Eastern Caribbean States |
| ECS | Extended Continental Shelf (est. 2003) |
| ECS | Educator Certification System (Illinois State Board of Education) |
| ECS | Sucre (former currency of Ecuador; now EUR) |
| ECS | Elective Caesarean Section (also seen as ELCS; obstetrics) |
| ECS | Enterprise Car Sales |
| ECS | Exceptional Customer Service (various companies) |
| ECS | Eppson Center for Seniors (Laramie, WY) |
| ECS | Executive Coaching Service (various organizations) |
| ECS | Education Cost Sharing (Connecticut) |
| ECS | External Computer System |
| ECS | Early Childhood School (various locations) |
| ECS | Education, Culture & Society (various schools) |