EFF

EFF or eff may refer to:

Politics

 * 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

Other uses

 * 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