FSF

FSF can stand for:

Organizations and activism

• Flight Safety Foundation, an international organization acting to improve aviation safety
• Free Software Foundation, non-profit corporation to support the free software movement, and in particular the GNU Project
• Free Speech Fights, a series of labor-related conflicts in the early 20th century US
• Financial Stability Forum
• FSF Cash Settlement Protocol

Arts and entertainment

• The Magazine of Fantasy & Science Fiction, also abbreviated F&SF
• F. Scott Fitzgerald, an American writer
• Folsom Street Fair
• Football Supporters' Federation
• Faroe Islands Football Association
• Federação Santomense de Futebol
• Further Seems Forever, a rock band
• Fugitive Strike Force, a 2006 television series
• Firestorm Films, an Australian-based film production company

• Factor XIII, fibrin stabilizing factor (Factor XIII)