MK or mk may refer to:
The Mk 14 Enhanced Battle Rifle (EBR) is an American selective fire military designated marksman rifle chambered for the 7.62×51mm NATO cartridge.
The Mk 19 grenade launcher (pronounced Mark 19) is an American 40 mm belt-fed automatic grenade launcher that was first developed during the Vietnam War.
MKE Ankaragücü or fully Makina ve Kimya Endüstrisi Ankaragücü (Turkish pronunciation: [ˈaŋkaɾaɟydʒy]), is a Turkish sports club located in the city of Ankara.
The Mk44 Bushmaster II is a 30 mm chain gun manufactured by Alliant Techsystems. It is a derivative of the 25 mm M242 Bushmaster, and uses 70% of the same parts as the M242 while increasing the firepower by as much as 50% with the 20% increase in caliber size.
The United States Navy Mark 12 Mod 0/1 Special Purpose Rifle (SPR) is a semi-automatic designated marksman rifle in service with United States Special Operations Forces used in the designated marksman role, also designed to be shorter than standard weapons.
Leonardo Lopez Perez (born January 20, 2001), also known by his gamertag MkLeo, is a Mexican professional Super Smash Bros.