JSF is a three-letter abbreviation with multiple meanings, as described below:
- JavaServer Faces, a specification for developing Java-based Web applications.
- Joint Strike Fighter Program
- F-35 Joint Strike Fighter, the former name of the F-35 Lightning II, a fighter airplane.
- JSF: Joint Strike Fighter, a video game published by Eidos Interactive
- Jabber Software Foundation, old name of XMPP Standards Foundation, XSF
- Jeux Sans Frontières, a Europe-wide television game show
- Joint Strike Force, a faction in the Tom Clancy's EndWar video game and novelization
- Jonathan Safran Foer, an American author
- Jedi starfighter, a vehicle in the Star Wars franchise vehicle