F11 or F-11 may refer to:
Military
- F 11 Nyköping, a Swedish Air Force wing
- F-11 Tiger, a 1954 U.S. Navy jet fighter originally designated F11F
- F11C Goshawk, a 1932 U.S. Navy biplane fighter
- Hughes XF-11, a 1946 U.S. Army Air Forces reconnaissance aircraft prototype
Science and academia
- Trichlorofluoromethane, a refrigerant used before 1995
- Factor XI, a clotting agent found in blood
Sports
- F11 (classification), a classification in para-athletics
Technology
- F11, a function key on a computer keyboard (enters and exits fullscreen mode in many web browsers)
- Fujifilm FinePix F11, a digital camera model
Transportation
- Chery F11, a 2008 Chinese Chery Automobile model
- Fairchild F-11 Husky, a 1946 Canadian bush plane
- Falconar F11 Sporty, a Canadian amateur-built aircraft design
- Fokker F.11, a 1928 flying boat
Other uses
- Finger Eleven, a Canadian alternative rock band
- Forest Eleven, a group of rainforest countries