| Abbreviation | Definition |
|---|---|
| ETPI | Education Tax Policy Institute |
| ETPI | European Tour Performance Institute |
| ETRI | Electronics and Telecommunications Research Institute |
| ETSI | Electronic Telecommunications Standard Institute |
| ETSI | Europe Technical Standards Institute |
| ETSI | European Telecom Standard Institute |
| ETSI | European Telecommunications Standards Institute |
| ETUI | European Trade Union Institute |
| EUIBA | European Union Institutions, Bodies and Agencies |
| EUISS | European Union Institute for Security Studies |
| EURAMET | European Association of National Metrology Institutes |
| EUSI | Edmonton United Services Institute |
| EVI | Ebbw Vale Institute |
| EVI | Electric Vehicle Institute |
| EVI | European Vision Institute |
| EVIT | East Valley Institute of Technology |
| EVMI | Earned Value Management Institute |
| EWBI | Evangelical Wesleyan Bible Institute |
| EWIA | Expert Witness Institute of Australia |
| EWIT | East West Institute of Technology |