Mark 23
# Mark 23

Mark 23 or Mk.XXIII or variation, may refer to:

## U.S. Navy

The U.S. Navy designation Mark 23 may refer to:

* Heckler & Koch Mark 23, a .45 ACP-caliber handgun
* Mark 23 machine gun, a configuration of the Stoner 63 weapons system used by US Navy SEALs.
* Mark 23 Pistol and Suppressor Kit, a Vietnam War-era kit issued to US Navy SEALs, containing a Mark 22 pistol and a Mark 3 noise suppressor.
* Mark 23 torpedo, a submarine-launched anti-ship torpedo used in World War II

## UK Royal Navy

* Mark 23 Grog, a British wire-guided 21-inch torpedo
* BL 6-inch Mk XXIII naval gun, a British WWII naval artillery gun
* QF 4-inch naval gun Mk XXIII, a British Cold-War submarine deck gun

## Other uses

* Bolo Mk XXIII, a fictional super-tank
