M12 or M-12 or M.12 may refer to:
Automobiles BMW M12, a turbocharged 1500 cc four-cylinder Formula One engine of the 1980s McLaren M12, a racing car for the Can-Am series Mercedes-AMG F1 M12 E Performance, a 2021-spec Formula One power unit Noble M12, a British sports car Vector M12, an automobile made by Vector Supercars
Aviation Beriev Be-12, Soviet Naval Designation M-12, a Soviet amphibious aircraft Grigorovich M-12, an improved version of the Grigorovich M-11, a Russian single-seat fighter flying boat designed by Dmitry Pavlovich Grigorovich Macchi M.12, a flying boat bomber produced in small numbers in Italy in 1918 Miles M.12 Mohawk, a 1930s British two-seat, tandem cabin monoplane
Military technology and weapons Armor, Vest, M12, developed in 1945 and used in the Korean War, was a 12-pound aluminum and nylon vest protecting against low-velocity fragments. Beretta M12, a sub-machine gun by Italian designer Beretta Doppelpistole M.12, a double-barrel submachine gun based on the Steyr M1912 semi-automatic pistol, developed by the Austrian firm Steyr Mannlicher Krupp 10.5 cm Haubitze M.12, a German howitzer used by Romania in World War I M12 Gun Motor Carriage, an American self-propelled artillery model Winchester Model 1912, a shotgun Zastava M12 Black Spear, a 12.7mm caliber anti-materiel rifle developed by Zastava Arms
Roads M-12 (Michigan highway), a former designation for part of U.S. Route 2 M12 motorway, in County Armagh, Northern Ireland M12 motorway (Great Britain), a proposed but never built motorway in southern England M12 Motorway (Sydney), Australia M12 highway (Russia) M-12 motorway (Pakistan) still under construction in Punjab, Pakistan M12 (East London), a Metropolitan Route in East London, South Africa M12 (Cape Town), a Metropolitan Route in Cape Town, South Africa M12 (Pretoria), a Metropolitan Route in Pretoria, South Africa M12 (Durban), a Metropolitan Route in Durban, South Africa M12 (Bloemfontein), a Metropolitan Route in Bloemfontein, South Africa M12 (Port Elizabeth), a Metropolitan Route in Port Elizabeth, South Africa M12 road (Zambia), a road in Zambia M12 road (Malawi), a road in Malawi Highway M12 (Ukraine), connecting Lviv Oblast to Central Ukraine
Space Messier 12, a globular cluster in the constellation Ophiuchus Progress M-12, a Russian unmanned cargo spacecraft launched in 1992 to resupply the Mir space station Progress M-12M, an unmanned Progress spacecraft that was lost in a launch failure in August 2011
Other M12 (artist collective), a Colorado-based artist collective M12 (Istanbul Metro), a rail line under construction in Istanbul, Turkey M12 (New York City bus), a New York City Bus route in Manhattan M12 (venture capital), a venture capital subsidiary of Microsoft M12 bolt, a size of ISO metric screw thread M12 connector, a size of IEC metric screw sized electrical connector Mathieu group M12, in the mathematical field of group theory Magic 2012, the thirteenth core set in Magic: The Gathering S-mount (CCTV lens), a CCTV lens mount using a M12x0.5 thread M12, a difficulty grade in mixed climbing