| Acronym | Definition |
|---|
| mg | Milligram |
| mg | Myasthenia Gravis |
| mg | Morris Garages (UK sports car manufacturer) |
| 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 | 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 | 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 |