EFF
- Economic Freedom Fighters
- Economic Freedom Fund
- Eff (duo)
- Eff (programming language)
- Efficiency (basketball)
- Effingham Junction railway station
- Election Fighting Fund
- Electronic Frontier Foundation
- Emmett/Furla Films
- Environmental Film Festival in the Nation's Capital
- Ethiopian Football Federation
- Evergreen Freedom Foundation
- F
- F (disambiguation)
- Fuck
- The Electronic Font Foundry