| Acronym | Definition |
|---|
| MRG | Merge |
| MRG | Minority Rights Group International |
| MRG | Mad River Glen (Vermont) |
| MRG | Messaging, Realtime and Grid (Red Hat) |
| MRG | Mouvement des Radicaux de Gauche (French: Left Radical Movement) |
| MRG | Monitoring and Reporting Guidelines (environment; EU) |
| MRG | Manyetik Rezonans Görüntüleme (Turkish :magnetic resonance imaging) |
| MRG | Movimiento de Resistencia Global (antiglobalization movement) |
| MRG | Mandalay Resort Group |
| MRG | Mechanical Rubber Goods |
| MRG | Minimum Revenue Guarantee |
| MRG | Music Research Group |
| MRG | Medical Reform Group |
| MRG | Main Reduction Gear |
| MRG | Multiple Range Gate |
| MRG | Mietrechtgesetz (German: Tenancy Act) |
| MRG | Mountain Rescue Group |
| MRG | Marketing Results Group |
| MRG | Murmurs, Rubs, or Gallops (cardiac assessment) |
| MRG | Metal Reinforced Gasket |
| MRG | Masada Resource Group, LLC (Birmingham, AL) |
| MRG | Movement Requirements Generator |
| MRG | Medium Range aircraft |
| MRG | Message Routing Guides |
| MRG | Material Review Group |
| MRG | Market Risk Group |