| Acronym | Definition |
|---|
| ECCS | European Convention for Constructional Steelwork (various organizations) |
| ECCS | Emergency Core Cooling System |
| ECCS | Extreme Conventional Combustion System |
| ECCS | Electronically Concentrated Control System |
| ECCS | Electrical, Communications and Cyber Systems (US NSF) |
| ECCS | European Conference on Complex Systems |
| ECCS | Elite Cruise Counselor Scholar (travel) |
| ECCS | Électricité Chauffage Cuisine Sanitaire (French: Electricity Heating Kitchen Sanitation) |
| ECCS | Fundamentals of Electronics, Communications and Computer Sciences (Institute of Electronics, Information and Communication Engineers) |
| ECCS | Expeditionary Command and Control Suite (US Marine Corps) |
| ECCS | Electrolytic Chrome-Coated Steel |
| ECCS | EKMR (Extended Karnaugh Map Representation) Compressed Column Storage |
| ECCS | Emergency Contamination Control Station |
| ECCS | Electro-Coated Chromium Steel |
| ECCS | Engineer Command and Control System |
| ECCS | Electronic Check Clearing System |
| ECCS | Enterprise and Customer Connection Services (Sprint) |
| ECCS | Environmentally-Conscious Corporate Strategy |
| ECCS | Emotional Content and Cooperation Score |
| ECCS | Evangelical Covenant Church of Sudan |