EFF or eff may refer to:
- Economic Freedom Fighters, a South African communist political party
- Economic Freedom Fund, an American political organization
- Election Fighting Fund, a British suffragist organization supporting the early Labour Party
- Electronic Frontier Foundation, a US-based international digital rights group
- Evergreen Freedom Foundation, an American political think tank
- Eff (duo), a German musical duo
- Eff (programming language), a functional programming language with focus on algebraic effects
- Efficiency (basketball), a statistical benchmark
- Effingham Junction railway station, Surrey, England, National Rail station code
- The Electronic Font Foundry, a British computer type foundry
- Emmett/Furla Films, now Emmett/Furla Oasis Films, an American production company
- Environmental Film Festival in the Nation's Capital, in Washington, D.C., United States
- Ethiopian Football Federation
- Extrusion freeform fabrication, a method for fabricating functionally graded material
- F, a letter of the alphabet
- A minced oath of the obscenity Fuck
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disambiguation page lists articles associated with the title EFF.
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