EFF or eff may refer to:
Politics Economic Freedom Fighters, a South African far-left 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 U.S.-based international digital rights group Evergreen Freedom Foundation, an American political think tank
Other uses Eff (duo), a German musical duo Eff (programming language), a functional programming language with focus on algebraic effects Effective topos, a model of constructive mathematics based on computability Efficiency (basketball), a statistical benchmark Effingham Junction railway station, Surrey, England, a 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, Washington, D.C., United States Ethiopian Football Federation, the governing body of association football in Ethiopia Extrusion freeform fabrication, a method for fabricating functionally graded material F, a letter of the alphabet A minced oath of the obscenity Fuck
See also F (disambiguation)