F23

F23 or F-23 may refer to:


 * Fluorine-23 (23F), an isotope of fluorine
 * Funk F-23, an American agricultural aircraft
 * Getrag F23 transmission, an Italian 5-speed manual transmission
 * Hirth F-23, an aircraft engine
 * HMS Kanimbla (F23), a passenger ship requisitioned for the Royal Navy
 * HMS Teazer (F23), a T-class destroyer of the Royal Navy
 * Northrop YF-23, an American prototype fighter aircraft