ECI
- ECI Partners
- ECI Telecom
- Early childhood intervention
- Earth-centered inertial
- Eastern Congo Initiative
- Eastwood Collegiate Institute
- Economic Complexity Index
- Efficiency of conversion
- El Corte Inglés
- Election Commission of India
- Emergency care instructor
- Employment cost index
- Engine Components Inc.
- Engineering Council of India
- Enhanced Cartridge Interface
- Enterprise content integration
- Etobicoke Collegiate Institute
- European Citizens' Initiative
- European Color Initiative
- Evangelical Church of India
- Evangelical Climate Initiative
- Extended Channel Interpretation
- Eze Castle Integration
- LTE (telecommunication)
- World Federation of Energy, Chemical and Various Industry Workers' Unions