| Abbreviation | Definition |
|---|---|
| ECSA | European Customs Sports Association |
| ECSB | European Council for Small Business |
| ECSC | European Coal and Steal Community |
| ECSC | European Coal and Steel Community |
| ECSC | European Community for Steel and Coal |
| ECSC | European Cooperation and Security Committee |
| ECSC | European Cyber Security Challenge |
| ECSF | European Combat Sambo Federation |
| ECSF | European Crowdfunding Stakeholders Forum |
| ECSG | European Cards Stakeholders Group |
| ECSG | European Company Sport Games |
| ECSG | European Cyber Security Group |
| ECSG | European Cybersecurity Group |
| ECSL | European Centre for Space Law |
| ECSM | European Centre for Social Media |
| ECSM | European Conference on Social Media |
| ECSM | European Cyber Security Month |
| ECSN | European Climate Support Network |
| ECSN | European Concrete Society Network |
| ECSO | European Council of Skeptical Organisations |