| Acronym | Definition |
|---|
| MRB | Martinsburg, WV (regional airport) |
| MRB | Malaysian Rubber Board |
| MRB | Missing Right Bracket |
| MRB | Multiple Resolution Bitmap |
| MRB | Major River Basin |
| MRB | Material Review Board |
| MRB | Maintenance Review Board (Commercial Aircraft Industry and FAA) |
| MRB | Media Resource Broker (software) |
| MRB | Medical Review Board |
| MRB | Mortgage Revenue Bonds (secondary mortgage financial instrument) |
| MRB | Marijuana Related Business |
| MRB | Merit Review Board (various organizations) |
| MRB | Multiple-Resolution Bitmap |
| MRB | Management Review Board |
| MRB | Mississippi River Bridge (Illinois and Missouri Departments of Transportation) |
| MRB | Meal Replacement Bar (nutrition) |
| MRB | Material Record Book (various companies) |
| MRB | Main Rotor Blade |
| MRB | Mystic Roots Band (band) |
| MRB | Marine Royale Britannique (French: British Royal Navy) |
| MRB | Motorized Rifle Battalion |
| MRB | Mooring Riser Buoy (off-shore oil production) |
| MRB | Merit Rating Board (Massachusetts) |
| MRB | Mission Requirements Board |
| MRB | Massachusetts Rating Bureau |
| MRB | Maximum Reservable Bandwidth |
| MRB | Marinated Raw Breaded (chicken) |
| MRB | Melbourne Rainbow Band (Melbourne, Australia) |
| MRB | Mouse Rebinder (program for changing mouse keys) |
| MRB | Manual Resuscitation Bag |
| MRB | Manufacturing Record Book |
| MRB | Most Reliable Basis |
| MRB | Malfunction Review Board |
| MRB | Mandrivausers Romanian Backports (Mandrivausers Romania Project) |
| MRB | Muslim Royal Brotherhood |
| MRB | Management Reserve Budget |
| MRB | Mike Renick Band (Cape Girardeau, MO band) |
| MRB | Message Relay Box |
| MRB | Master Reference Buoy |
| MRB | MADS Resource Board |
| MRB | Medical Recruiting Brigade (US Army) |
| MRB | Master Record Boot |
| MRB | Medium Response Boat |
| MRB | Materiel Requirements Branch |