Mach 4

Mach 4 or variant, may refer to:


 * Mach number for four times the speed of sound
 * Supersonic speed of 4 times the speed of sound
 * MACH-4 (Marvel Comics), a comic book superhero
 * Fly Castelluccio Mach 4, a paramotor aircraft
 * Kawasaki H2 Mach IV, the "Mach IV" motorcycle
 * .17 Mach IV, the .17-calibre Mach IV center-fire rifle bullet
 * Mach IV, a personality rating on the rating scale Dark Triad Dirty Dozen
 * Mach 4, a version of the Mach microkernel developed at the University of Utah