| MG | Machine Gun | |
| MG | Manager | |
| MG | Magnesium | |
|
| MG | Minas Gerais (Brazil) | |
| MG | Metal Gear (game) | |
| MG | Management Group | |
| MG | Medical Group | |
| MG | Major General | |
| MG | Mardi Gras | |
| MG | Morning Glory | |
| MG | Madagascar (ISO country code, top level domain) | |
| MG | Mongolia | |
| MG | Master Gardener | |
|
| mg | Milligram | |
| MG | Media Gateway (packet based telephony; between PSTN and packet network) | |
| MG | Medical Genetics | |
| MG | Magical Girl (fiction genre; Japan) | |
| MG | Malachite Green (dye) | |
| MG | Middle Grade | |
| MG | Municipal Government | |
| MG | Myasthenia Gravis | |
| MG | Morris Garages (UK sports car manufacturer) | |
| mg | Microgram | |
| MG | Mel Gibson (actor/producer) | |
| MG | Mixed Grain (lumber industry) | |
| MG | Minister of the Gospel | |
| MG | Marvin Gaye (singer) | |
| MG | Make-Good | |
| MG | Mahatma Gandhi | |
| MG | Mechagodzilla | |
| MG | Magic Gate (Sony memory card DRM) | |
| MG | Middle Ground (sprite comic website) | |
| MG | Mean Girls (film) | |
| MG | Mini-Golf | |
| MG | Maschinengewehr (German: Machine Gun) | |
| MG | Motor-Generator | |
| MG | Match Game | |
| MG | Mini-Game (gaming) | |
| MG | Military Government | |
| MG | Machine Gunner | |
| MG | Main Gauche (accordion, left hand side) | |
| MG | Matt Groening | |
| MG | Missing Grade (various schools) | |
| MG | Meiji Gakuin University (also seen as MGU; Japan) | |
| MG | Milligauss | |
| MG | Miniature Golf | |
| MG | Milli Gazette (Indian newspaper) | |
| Mg | Megagram (metric tonne) | |
| MG | Monitoring Group (supervisory body) | |
| MG | Marine Group | |
| MG | Monster Garage (Discovery Channel) | |
| MG | Marker Group (various locations) | |
| MG | Metal Gate (semiconductors) | |
| MG | Molecular Geometry (chemistry) | |
| MG | Mini-Gun (light machine gun) | |
| MG | Managing Gigabytes | |
| MG | Magic Gladiator (gaming) | |
| MG | Maximum Gain (antennas) | |
| MG | Mongolian Grill (restaurant) | |
| MG | Metallgesellschaft (Frankfurt, Germany) | |
| MG | Master Gunner (UK Military) | |
| MG | Machine-Glazed | |
| MG | Missile Guidance (radar) | |
| MG | Metre-Gauge (railway) | |
| MG | Minimum Guarantee | |
| MG | Main Generator | |
| MG | Message Generator | |
| MG | Multinational Group | |
| MG | Mauser Gewehr (WWII German infantry) | |
| MG | Multi-Grid (algorithm) | |
| MG | Moongate (online game, now Materia Magica) | |
| MG | Medal for Gallantry (Australian Defence Force) | |
| MG | Menin Gate | |
| mG | Miles Gloriosus (gaming clan) | |
| MG | Minority Game (financial markets model) | |
| MG | Maxwell-Garnett (formula) | |
| MG | Middle Gimbal (astronomy) | |
| MG | Marine Gunner | |
| MG | Message Gateway | |
| MG | Mastergroup | |
| MG | Mario Guide (website) | |
| MG | Mongomery Gentry (band) | |
| MG | Meibion Glyndwr (Welsh) | |
| MG | Morewood Gardens (Carnegie Mellon University) | |
| MG | Mega Geek | |
| MG | Mirovna Grupa | |
| MG | Machinist's Mate, Industrial Gas Generating Mechanic (US Navy) | |
| MG | Mean Grayness | |
| MG | My God | |