EFI
- Andrey Efi
- EFI Automotive
- EFI system partition
- Effie
- Efi Arazi
- Efi Foufoula-Georgiou
- Efi Oshaya
- Efi Thodi
- Efik language
- Electronic fuel injection
- Electronics for Imaging
- Enrico Fermi Institute
- Enterprise Florida
- Environmentalist Foundation of India
- Enzyme Function Initiative
- Equestrian Federation of India
- Equestrian Federation of Ireland
- European Federation for Immunogenetics
- European Forest Institute
- European Friends of Israel
- Evangelical Friends International
- Expeditionary Forces Institute
- Exploding foil initiator
- Extensible Firmware Interface
- Tufuga Efi
- École Française d'Islamabad