the top-level domain code for the Republic of Macedonia

Gospel of Mark

Mortal Kombat, a popular fighting video game series

Mind control, also as a verb: "He was MK'd". (cf. MK-ULTRA)

Monk, in the Christian Church; when the term Mk. follows the name of a Christian saint it denotes that the saint was a Monk.

Milton Keynes, a large town in southern England

Monster Kill, a way of killing in the game Unreal Tournament

Macedonian language: ISO 639 digram

Mario Kart, a Nintendo racing video game series

SSCI Mystic Kingdom, a SubSpace (computer game) zone

The Mk reference point, an interface of the IMS used to exchange messages between BGCFs in different networks

Meta Knight

Mary-Kate Olsen

Umkhonto we Sizwe, the military wing of the African National Congress (ANC)

Morse-Kelley set theory

Mebyon Kernow, Cornish for "Sons and daughters of Cornwall" - Campaigns for greater self-government for Cornwall in the form of a devolved Cornish Assembly or "Senedh Kernow"

Mong Kok, a place in Hong Kong

Morris Knolls High School in Denville, New Jersey

The IATA airline designator for Air Mauritius

Member of Knesset, the legislature of Israel

Missionary Kids, the children of missionary parents

Markup (business), a term for the increase in the price of goods to create a profit margin for a business

Mark (designation), abbreviation of

Mark Kinchen, dance music producer aliased MK

MK electric, a major manufacturer of electrical goods

Mk, a make replacement in the Plan 9 from Bell Labs and Inferno operating systems.

MK Sportscars

Megakelvin (MK only), an SI unit of temperature

Millikelvin, (mK only) an SI unit of temperature

Mysore Kirloskar Company in India was known by MK.

The Mushroom Kingdom, the setting of Super Mario Bros. series video games

Makai Kingdom, a tactical role-playing game

MK89, a mostly Afrikaans music channel, that is part of the DStv bouquet of satellite channels based in South Africa.