ECS

• Education Commission of the States, in the United States
• Engleside Christian School, in Alexandria, Virginia, United States
• 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

• Electrochemical Society, a learned society
• Embodied cognitive science
• Endocannabinoid system
• Erosion control structures used in stream restoration
• Equilibrium climate sensitivity
• European Calcium Society

• 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

• 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

• 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

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