XF4

XF4 may refer to:

Aircraft

 * Douglas F4D Skyray (prototype designation XF4D-1), jet fighter-interceptor
 * Grumman F4F Wildcat (experimental designations XF4F-1 to XF4F-3), monoplane fighter
 * McDonnell Douglas F-4 Phantom II (experimental designation XF4H-1), jet fighter-bomber
 * Vought F4U Corsair (experimental designation XF4U-1), monoplane fighter

Other uses

 * The X Factor (British series 4), British TV series
 * Radio callsign for the Revillagigedo islands in Mexico - see Call signs in Mexico