Mark XII or Mark 12 often refers to the twelfth version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."
Mark XII or Mark 12 can specifically refer to:
In military and weaponry
- BL 6 inch Mk XII naval gun; a British naval gun
- MK-3-12 (1907); a Russian naval main weapon that used three 12-inch guns in a single mounting
- Mark 12 torpedo (1930); an American 21-inch torpedo
- 5"/38 Mark 12 (1934); a widely used American 5-inch naval gun
- 18-inch Mark XII (1935); a British 18 inch torpedo
- Supermarine Spitfire Mk XII (1942–1944); the first Griffon-engined Spitfire variant
- Hawker Hurricane Mk XII (1942); a Canadian-built Hurricane variant
- Gloster Meteor Mk XII; a British night fighter variant with American radar
- 21-inch Mark 12 (1952); a British torpedo
- Mark 12 nuclear bomb (1954–1962); an American nuclear bomb
- Colt Mk 12 cannon; a US Navy aircraft gun used in the 1950s and 1960s
- United States Navy Mark 12 Mod X Special Purpose Rifle (2002); a weapon system in use by United States Special Operations Forces
- Sumlock ANITA calculator Mark 12 (1966); a British hybrid cold-cathode tube and transistor logic calculator
- Mark 12 or Mark XII, the twelfth chapter of the Gospel of Mark in the New Testament of the Christian Bible
- Vox Mark XII; a 12-string electric guitar made in the 1960s
|This disambiguation page lists articles associated with the title Mark XII.
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