Madagascar (MG), an island nation in the Indian Ocean, off the southeastern coast of Africa

Metre gauge - 1000mm

Match Game (MG) (1962–1969; 1973–1979; 1983–1984; 1990–1991), American television game show

Magnesium (Mg), the element

Machine gun (MG), typically used as a prefix for model designations (for example "MG42" and "MG3")

MonstersGame (MG), a browser-based Role-playing game

Myasthenia gravis (MG), an autoimmune disease

Minas Gerais (MG), a Brazilian state

Metal Gear, (MG), a video game series directed by Hideo Kojima.

MG (car) (1924–), British automobile manufacturer, now part of China's Nanjing Automobile Group

Mechagodzilla, a fictional character from various films in the Godzilla series

Major General (MG), a military rank used by many countries; the specific "MG" abbreviation is used in the United States

Miami Gardens, a city in northern Miami-Dade County, Florida

Malagasy language (mg), the national language of Madagascar

Master Grade (MG), a classification of Gundam plastic models

MGM Grand Air (MG) (1987&ndahs;1994), American charter airline; predecessor to Champion Air

Champion Air (MG) (1995–), American charter airline

Medal for Gallantry (MG), Australian military decoration, introduced in 1991

mg (editor) (mg), Emacs-compatible Unix text editor

Memphis Groove (MG), from the band Booker T. & the M.G.s fronted by Booker T. Jones