ECS may refer to:
Education Education Commission of the States, in the United States Engleside Christian School, in Alexandria, Virginia, United States Environmental Charter School, Pittsburgh, Pennsylvania, United States; partly housed in the former Park Place School Etowah City School in Etowah, Tennessee, United States Evangelical Christian School, in Memphis, Tennessee, United States Evangelical Christian School (Fort Myers, Florida) Evansville Christian School, in Evansville, Indiana, United States Everett Christian School, in Everett, Washington, United States Miss Edgar's and Miss Cramp's School, in Westmount, Quebec, Canada School of Education, Communication and Society, King's College London, United Kingdom School of Electronics and Computer Science, University of Southampton, United Kingdom
Science Electrochemical Society, a learned society Embodied cognitive science Endocannabinoid system Erosion control structures used in stream restoration Equilibrium climate sensitivity European Calcium Society
Technology Amiga Enhanced Chip Set, a chipset used in several Amiga computers eComStation, a computer operating system based on OS/2 Edinburgh Concurrent Supercomputer EDNS Client Subnet Elitegroup Computer Systems, a Taiwanese electronics firm Emergency communication system Enterprise cognitive system Entity component system, a software architecture pattern Environmental control system
Transport Eccles Road railway station, Breckland, England (National Rail station code) Empty coaching stock, in rail transport Estuary Crossing Shuttle, a bus service in Oakland, California Metrovagonmash Ečs, a Russian multiple unit used in the Prague Metro
Other uses East Coast Swing Écs, a village in Hungary Ecuadorian Sign Language European Solidarity Centre Ecuadorian sucre, a former currency of Ecuador Emerald City Supporters, a supporters' group for the Seattle Sounders soccer club Entertainment Crew & Sport, a section of the Media, Entertainment and Arts Alliance, Australia Esports Championship Series