XF3 may refer to:
Aviation Bell D-188A (also designated XF3L), proposed supersonic tiltjet fighter Berliner-Joyce XF3J, biplane fighter Grumman F3F (experimental designation XF3F-1), biplane fighter Ishikawajima-Harima F3 (development designation XF3), turbofan jet engine Vought XF3U, prototype biplane fighter Wright XF3W Apache, racing aircraft
Other uses (49379) 1998 XF3, minor planet The X Factor (British series 3), British TV series Radio callsign for the Caribbean islands in Mexico - see Call signs in Mexico