| Abbreviation | Definition |
|---|---|
| ECHO | Educational Charitable And Humanitarian Organization |
| ECHO | English Carp Heritage Organization |
| ECHO | European Community Humanitarian Office |
| ECI | European Citizens Initiative |
| ECIU | Energy and Climate Intelligence Unit |
| ECLAC | Economic Commission for Latin America and the Caribbean |
| ECLC | Eastern Community Legal Centre |
| ECM | Executive Committee Member |
| ECMA | Ethiopian Community Mutual Association |
| ECMEA | Erie County Music Educators Association |
| ECO | Earth-Conscious Organization |
| ECO | Environmentally Creative Organizers |
| ECOCENTER | Ecology Center |
| ECOG | European Childhood Obesity Group |
| EcoSan | Ecological Sanitation |
| ECRI | Emergency Care Research Institute |
| ECS | Education Commission of the States |
| ECSA | Eastern Connecticut Sailing Association |
| ECSC | European Coal and Steel Community |
| ECSF | European Cardiology Section Foundation |