JSF may refer to: JavaServer Faces (now Jakarta Faces), a specification for building web application user interfaces Jabber Software Foundation, now the XMPP Standards Foundation Joint Strike Fighter program, a military aircraft acquisition program begun in the 1990s F-35 JSF, alternative name of the resulting Lockheed Martin F-35 Lightning II United States Joint Strike Force, a faction in the video game Tom Clancy's EndWar Joint Strike Fighter (video game) Jatio Sramik Federation, a trade union federation in Bangladesh Jeux sans frontières, a European-wide television game show Jonathan Safran Foer (born 1977), American author