MG

• Magnesium (Mg), the element.
• Milligram (mg) an SI unit of mass, 1/1,000th of a gram (base unit of mass).
• Megagram (Mg) an SI unit of mass 10⁶ of a gram.
• Myasthenia gravis (MG), an autoimmune disease.
• Minas Gerais (MG), a Brazilian state.
• the mass of an object multiplied by the gravitational acceleration which equals the force.
• Madagascar, ISO 3166-1 country code
• .mg, the Internet country code top-level domain for Madagascar.
• Malagasy language (mg), the national language of Madagascar.
• Mongolia, FIPS 10-4 country code
• Main gauche (m.g., French), indicating "left hand" in piano music.
• mg (editor) (mg), Emacs-compatible Unix text editor .
• Mahatma Gandhi, popular name for Mohandas Karamchand Gandhi.

Business

• MG Cars (1924-Present), British automobile manufacturer, now part of SAIC.
• Modern Green (MG+) (2001–), the Experience agency, based in Dublin.
• Champion Air (MG) (1995–), previously MGM Grand Air, American charter airline with IATA code MG.
• Mobile and Gulf Railroad

Education

• Matematička gimnazija, special elementary and high school for gifted and talented students located in Belgrade, Serbia.

Military

• Machine gun (MG), typically used as a prefix for model designations (for example "MG42" and "MG3").
• Major General (MG), a military rank used by many countries; the specific "MG" abbreviation is used in the United States.
• Medal for Gallantry (MG), Australian military decoration, introduced in 1991.

Entertainment

• Match Game (MG) (1962–1969; 1973–1979; 1983–1984; 1990–1991), American television game show.
• Mechagodzilla, a fictional character from various films in the Godzilla series.
• Memphis Group (M.G.), from the band Booker T. & the M.G.'s fronted by Booker T. Jones.
  • The MG's (album), an album recorded by Booker T.'s band.
• Metal Gear (series), (MG), a video game series directed by Hideo Kojima.
  • Metal Gear, the first game in the series.
• Meteor Garden, the 2001 Taiwanese drama.
• Mother Goose, character and poem.
• MG (The Perhapanauts), a character in The Perhapanauts comics.
• Meg Griffin a character on Family Guy voiced by Mila Kunis.
• Mystery Girl, Roy Orbison album.