| MRU | Machine Records Unit 
| Others |
| MRU | Magnetic Resonance Urography
| Others |
| MRU | Mahebourg, Mauritius
| Others |
| MRU | Mahler Recovery Unit
| Others |
| MRU | Maintenance and Repair Unit
| Others |
| MRU | Major Rescue Unit
| Others |
| MRU | Malaysia Rugby Union
| Others |
| MRU | Manav Rachna University
| Others |
| MRU | Manifest Review Unit
| Others |
| MRU | Mankind Research Unlimited
| Others |
| MRU | Mano River Union
| Others |
| MRU | Marginal Revolution University
| Others |
| MRU | Maximum Receive Unit
| Others |
| MRU | Maximum Reception Unit
| Others |
| MRU | Maximum Rule Use
| Others |
| MRU | Mechanical Refrigeration Unit
| Others |
| MRU | Medical Rehabilitation Unit
| Others |
| MRU | Medical Response Unit
| Others |
| MRU | Meningococcal Reference Unit
| Others |
| MRU | Mi Reza Unidos
| Others |
| MRU | Miami Regional University
| Others |
| MRU | Migration Research Unit
| Others |
| MRU | Mill River Union High School
| Others |
| MRU | Minimum Replacement Unit
| Others |
| MRU | Minimum Revisable Unit
| Others |
| MRU | Mobile Radio Unit
| Others |
| MRU | Modular Refrigeration Unit
| Others |
| MRU | Mole Repeat Unit
| Others |
| MRU | Most Recently Used
| Others |
| MRU | Motion Reference Unit
| Others |
| MRU | Motion Reference Units
| Others |
| MRU | Mount Royal University
| Others |
| MRU | Mountain Rescue Unit
| Others |
| MRU | Movement Release Unit
| Others |
| MRU | Much Regret Unable
| Others |
| MRU | Much Regret Unable to attend
| Others |
| MRU | Mykolas Romeris University
| Others |
| MRU | Mykolo Romerio universitetas
| Others |