EFF may refer to:* The Effective Federal funds rate Electronic Frontier Foundation, a U.S. non-profit advocacy group Economic Freedom Fund, a U.S. political organization Equipped for the Future, a U.S. non-profit adult literacy project Election Fighting Fund, a UK fundraising organisation in the 1910s Ethiopian Football Federation, the governing body of football in Ethiopia Evergreen Freedom Foundation, a U.S think-tank European Fisheries Fund, a fund allocated by the European Union DC Environm… (More on Eff)