EFI

• Efi Arazi (1937–2013), Israeli businessman and high-tech entrepreneur
• Efi Foufoula-Georgiou (born 1957), Greek-American environmental engineer
• Efi Oshaya (born 1956), Israeli politician
• Efi Thodi (born 1934), Greek singer

• Andrey Efi (born 1960), Russian artist
• Tufuga Efi (born 1937), Samoan politician

• Electronic fuel injection
• Exploding foil initiator
• Extensible Firmware Interface, a computer firmware standard
• EFI system partition

• École Française d'Islamabad, a French international school in Pakistan
• EFI Automotive, a French automotive company
• Efik language
• Electronics for Imaging, an American digital printing company
• Enrico Fermi Institute, at the University of Chicago
• Enterprise Florida, an American economic development organization
• Environmentalist Foundation of India, a wildlife conservation group
• Enzyme Function Initiative, a computational biology project
• Equestrian Federation of India
• Equestrian Federation of Ireland, now Horse Sport Ireland
• European Federation for Immunogenetics, a scientific society
• European Forest Institute, an international organisation
• European Friends of Israel, a political organization
• Evangelical Friends International, a Christian religious organization
• Expeditionary Forces Institute, of the British Navy, Army and Air Force Institutes

• Effie

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