| Abbreviation | Definition |
|---|---|
| EMSA | European Masters Sports Association |
| EMSA | European Medical Students' Association |
| EMSOA | Eastern MA Soccer Officials Association |
| EMSOA | Eastern Mass Soccer Officials Association |
| EMSOA | Eastern Mass Swim Officials Association |
| EMSSA | Eastern Massachusetts Senior Softball Association |
| EMTA | Emerging Markets Traders Association |
| ENA | European NORM Association |
| ENA | European Nurserystock Association |
| ENACTUS | ENtrepreneurial ACTion |
| ENAO | Emergency Nurses Association of Ontario |
| ENFA | European Network of Fibromyalgia Associations |
| ENFIA | Eastern National Forests Interpretive Association |
| ENGAA | East Norriton Girls Athletic Association |
| ENIA | Erie and Niagara Insurance Association |
| ENIGMA | European Numbers Information Gathering and Monitoring Association |
| ENMA | Eastside Nihon Matsuri Association |
| ENNA | European Nanoscience and Nanotechnology Association |
| ENOA | Eastern Nebraska Officials Association |
| ENPA | Enrolled Nurse Professional Association |