FSF may refer to:

Organizations Free Software Foundation, an American non-profit organization with a mission to promote computer user freedom Federal Security Force (Pakistan) Federación de Sindicatos Ferroviarios, a defunct Argentine trade union Financial Stability Forum, a defunct international organization of financial regulators Finlands svenska författareförening, the Society of Swedish Authors in Finland Flight Safety Foundation, an international independent, non-profit organization for research, education, and communications in the field of civil aviation flight safety Föreningen Sveriges Filmfotografer, the Swedish Society of Cinematographers Progressive Party, an Icelandic political party (in Icelandic: Framsóknarflokkurinn) Freiwillige Selbstkontrolle Fernsehen, German television rating content board.

Arts and entertainment Folsom Street Fair, a street fair in San Francisco, California, United States Further Seems Forever, a rock band Fugitive Strike Force, a 2006 television series The Magazine of Fantasy & Science Fiction, also abbreviated F&SF Speculative fiction (genre) containing the subgenre of fantasy/science fiction (F/SF) Science fantasy (genre), a mixed genre of fantasy and science fiction elements Festival of Slovenian Film, an annual film festival in Portorož, Slovenia

Sports Faroe Islands Football Association (Faroese: ) Federação Sergipana de Futebol, the Football Federation of Sergipe, Brazil Football Supporters' Federation Fuerte San Francisco, a Salvadoran football club Sahrawi Football Federation (Spanish: ) São Toméan Football Federation (Portuguese: ) Senegalese Football Federation (French: )

Other uses Familial Shar Pei fever Females who have sex with females Fibrin-stabilizing factor Flexible Support Fund in the United Kingdom Fourth suit forcing, a bidding convention in the game of contract bridge Free speech fights, a series of 20th-century labor-related conflicts in the United States Full state feedback

See also