| Acronym | Definition |
|---|
| MRN | Motor Racing Network |
| MRN | Message Reference Number |
| MRN | Multi Region Network |
| MRN | Me Right Now |
| MRN | Medical Record Number |
| MRN | Movement Reference Number (shipping) |
| MRN | Mind Research Network (neuroscience) |
| MRN | Missouri Recovery Network (est. 1999) |
| MRN | Magnetic Resonance Neurography |
| MRN | Migrants' Rights Network (UK) |
| MRN | Mister Rogers' Neighborhood (TV show) |
| MRN | Multi-Region Network (switching technology) |
| MRN | Most Responsible Nurse |
| MRN | Money Recovery Nationwide (collection agency) |
| MRN | Material Receiving Note |
| MRN | Medicare Remittance Notice |
| MRN | Mobile Random Network |
| MRN | Matières Radioactives Naturelles |
| MRN | Meteorological Rocket Network |
| MRN | Missions Resource Network (Bedford, TX) |
| MRN | Manufacturers Resource Network |
| MRN | Movimiento de Renovación Nacional (Spanish: National Renovation Movement; Panama; also seen as MORENA) |
| MRN | My Referral Network (website) |
| MRN | Morgue Reference Number |
| MRN | Material Return Note |
| MRN | Mobile Robot Navigation |
| MRN | Mouvement de la Reconstruction Nationale (French: Movement for National Reconstruction, Haiti) |
| MRN | Movement Request Number |
| MRN | Member Reference Number |
| MRN | Mine Reference Number |
| MRN | Mathura Refinery Nagar (Mathura, Indian Oil Corp.) |
| MRN | Manufacturers Reference Number |
| MRN | Ministère de Ressources Naturelles et de la Faune (French: Department of Natural Resources and Wildlife; Quebec, Canada) |
| MRN | Merchant Repair Network (service technician registry) |
| MRN | Maritime Rescue Network |