6F

6F or 6-F can refer to:


 * Six Flags amusement parks
 * Ford 6F transmission; see GM-Ford 6-speed automatic transmission
 * A-6F, a model of Grumman A-6 Intruder
 * Grumman F6F Hellcat
 * Sucrose 6F-alpha-galactosyltransferase
 * Cunningham-Hall Model PT-6F, a model of Cunningham-Hall PT-6
 * ER-6f, an alternate name for the Kawasaki Ninja 650R
 * 6F, the production code for the 1983 Doctor Who serial Mawdryn Undead
 * Primera Air Nordic, a Latvian airline (IATA code 6F, 2014-2018)