| Abbreviation | Definition |
|---|---|
| ECOA | Ethics Compliance Officer Association |
| ECPA | Eastern Catholic Pastoral Association |
| ECRA | East Coast Reiners Association |
| ECRA | East County Repeater Association |
| ECRA | Elkhart County Radio Association |
| ECRA | European Cave Rescue Association |
| ECRAG | Entertainment Critics Reviewers Association of Ghana |
| ECSA | Edinburgh College Student Association |
| ECSA | Edinburgh College Students Association |
| ECSA | Edinburgh College Students' Association |
| ECSA | European Chlorinated Solvent Association |
| ECSA | European Citizen Science Association |
| ECTA | East Coast Timing Association |
| ECTA | Essex County Trail Association |
| ECTA | European Competitive Telecommunications Association |
| ECTA | European Core and Tube Association |
| ECVA | East Coast Volleyball Association |
| ECVA | Eastern Caribbean Volleyball Association |
| ECVA | Eastern Collegiate Volleyball Association |
| ECWA | East Coast Wrestling Association |