'''Free Software Foundation (FSF)''' je neprofitna organizacija. Ustanovil jo je [[Richard Stallman|Richard M. Stallman]] 4. oktobra 1985 v podporo pri promociji [[prosto programje|prostegasvobodnega programja]]. Organizacija promovira univerzalno svobodo pri ustvarjanju, distribuciji in spreminjanju računalniške programske opreme<ref>{{cite web|url=http://www.fsf.org/about/ |title=Free software is a matter of liberty, not price|publisher=Free Software Foundation| accessdate=2012-07-22}}</ref> izdano pod "copyleft" pogoji<ref>{{cite web|url=http://www.gnu.org/licenses/gpl-faq.html |publisher=Free Software Foundation |title=Frequently Asked Questions about the GNU Licenses |accessdate=2012-07-22}}</ref>, npr. [[GNU]] [[Splošno dovoljenje GNU]].<ref>{{Cite web|title=What Is Copyleft? |url=http://www.gnu.org/copyleft/copyleft.html |publisher=Free Software Foundation |accessdate=2012-07-22}}</ref> FSF je registrirana v [[Massachusetts]]u, ZDA.<ref name="FSF MACorpRegistry">{{cite web|url=http://corp.sec.state.ma.us/corp/corpsearch/CorpSearchSummary.asp?ReadFromDB=True&UpdateAllowed=&FEIN=042888848|title=FREE SOFTWARE FOUNDATION, INC. Summary Screen | publisher=The Commonwealth of Massachusetts, Secretary of the Commonwealth, Corporations Division|accessdate=2009-04-06}}</ref>
Od ustanovitve do sredine 1990-ih let, so bila sredstva fundacije namenjena primarno razvijalcem prostegasvobodnega programja. Od sredine 1990-ih let dalje so zaposleni pri FSF in prostovoljci delali večinoma pri urejanju statusa in strukturnih spremembah v organizaciji in FSF komuni. FSF organizacija pri svojem delu uporablja izključno prostosvobodno programje na svojih računalnikih.<ref>{{cite web | url = http://www.gnu.org/philosophy/linux-gnu-freedom.html | title = Linux, GNU, and freedom | accessdate = 2006-12-10 | author = Stallman, Richard M. | authorlink = Richard Stallman | year = 2002 | work = Philosophy of the GNU Project | publisher = GNU Project }}</ref>
