XF5 may refer to:
Aviation Grumman XF5F Skyrocket, experimental twin-engined interceptor IHI Corporation XF5. turbofan jet engine Northrop F-5 (experimental designation XF5-A), supersonic light fighter Vought XF5U "Flying Flapjack", experimental disc-winged fighter
Other uses The X Factor (British series 5), British TV series