| MRG | Mad River Glen 
| Others |
| MRG | Madison Risk Group
| Others |
| MRG | Magnum Radio Group
| Others |
| MRG | Main Reduction Gear
| Others |
| MRG | Maintenance Repair Group
| Others |
| MRG | Mammary-derived growth inhibitor Related Gene
| Others |
| MRG | Management Research Group
| Others |
| MRG | Management Resource Group
| Others |
| MRG | Manufacturing Resource Group
| Others |
| MRG | Mareeba, Queensland, Australia
| Others |
| MRG | Marketing Resource Group
| Others |
| MRG | Marshall Retail Group
| Others |
| MRG | Marxist Reading Group
| Others |
| MRG | Materialized Reachability Graph
| Others |
| MRG | McDowell Rackner Gibson
| Others |
| MRG | McKenzie River Gathering
| Others |
| MRG | Meathead Ramp Games
| Others |
| MRG | Mechanical Resource Group
| Others |
| MRG | Mechanical Rubber Goods
| Others |
| MRG | Media Relations Group
| Others |
| MRG | Medicaid Reference Guide
| Others |
| MRG | Message Relationship Guide
| Others |
| MRG | Message Routing Guide
| Others |
| MRG | Messaging Realtime and Grid
| Others |
| MRG | Messaging Realtime Grid
| Others |
| MRG | Mill Restaurant Group
| Others |
| MRG | Millennium Research Group
| Others |
| MRG | Mineral Royalty Grant
| Others |
| MRG | Minimum Revenue Guarantee
| Others |
| MRG | Minority Rights Group
| Others |
| MRG | Mission Requirements Group
| Others |
| MRG | Mix Religious Group
| Others |
| MRG | Mobile Robot Group
| Others |
| MRG | Mondello Radio Group
| Others |
| MRG | Monitoring and Reporting Guidelines
| Others |
| MRG | Mouvement des Radicaux de Gauche
| Others |
| MRG | Movement Requirements Generator
| Others |
| MRG | Mr Restaurant Gal
| Others |
| MRG | Mulgara RDF Graphs
| Others |
| MRG | Multimedia Research Group
| Others |
| MRG | Murmurs, Rubs, or Gallops
| Others |