MG, Mg, or mg and variants may refer to:

Organizations

* MG Cars, an automotive marque of the now defunct MG Car Company * MG Motor, a present-day car manufacturing company *MG JW Automobile, a Pakistani automobile manufacturer * Champion Air (IATA code) * Mathematical Grammar School, Matematička gimnazija, a school in Belgrade * Monte Generoso railway

Arts and entertainment

* MG, a character in ''The Perhapanauts'' comics * ''Match Game'', a television game show * Magilla Gorilla, a cartoon character

Music

* ''Glossary of music terminology, Main gauche'', "left hand" in piano playing * MG (Martin Gore album), ''MG'' (Martin Gore album) * The M.G.'s, from the band Booker T. & the M.G.'s * The MG's (album), ''The MG's'' (album), an album by the M.G.'s * MG Select, a house duo music production including George Jackson (music producer), George Jackson * M:G, real name Maribel Gonzalez, dance music singer

Military

* Machine gun (MG-), prefix for model designations, for example, "MG42" * Major general, a military rank * Medal for Gallantry, a military decoration

Places

* Madagascar (ISO 3166-1 country code MG) ** .mg, the Internet country code top-level domain for Madagascar * Minas Gerais, Brazil * Mongolia (FIPS 10-4 country code MG)

Science and technology

* .mg, the Internet country code top-level domain for Madagascar * mg (text editor), a text editing program * Magnesium, a chemical element with symbol Mg * Motor–generator, Motor-generator, a device for converting electrical power to another form * Manual Gates, a type of Level crossings in the United Kingdom, level crossing used in the United Kingdom * Microgrid, a local architecture for power grid within the concept of Smart grid, Smart Grid that can function both connected to and isolanded from the main grid. * Force of gravity, product of mass (''m'') by acceleration of gravity (''g'') * MagicGate and OpenMG, encryption technologies of Sony

Biology and medicine

* Michaelis–Gutmann bodies, Michaelis-Gutmann bodies, concentrically layered basophilic inclusions in the urinary tract * Monoglyceride, or monoacylglycerol * Myasthenia gravis, a neuromuscular disease * ''Mycoplasma gallisepticum'', a disease affecting chickens and other birds * ''Mycoplasma genitalium'', a sexually transmitted bacterium

Units of measurement

* Kilogram, Milligram (mg), equal to 10⁻³ grams * Tonne, Megagram (Mg), equal to 10⁶ grams * Gauss (unit), Milligauss (mG), equal to 1.0 × 10⁻⁷ teslas * Gauss (unit), Megagauss (MG), equal to 100 teslas

Other uses

* Mg (magazine), ''Mg'' (magazine), an American business monthly * Malagasy language * Outlaw motorcycle club (motorcycle gang) * Matt Groening