F103

F103 may refer to :


 * Audi F103, a 1965 internal designation for a series of car models
 * Blas de Lezo (F103), a 2004 Spanish Navy Álvaro de Bazán class frigate
 * Tamiya F103, a 1/10 scale radio controlled Formula One chassis by Tamiya Corporation
 * General Electric F103, a jet engine
 * HMS Lowestoft (F103), a British Royal Navy Rothsay class anti-submarine frigate
 * Republic XF-103 Thunderwarrior, a cancelled fighter aircraft development project