| MRN | Mine Reference Number | 矿山参考号 |
| MRN | Mathura Refinery Nagar (Mathura, Indian Oil Corp.) | 马图拉炼油厂Nagar（马图拉，印度石油公司） |
| MRN | Medicare Remittance Notice | 医疗保险汇款通知 |
| MRN | Mobile Random Network | 移动随机网络 |
| MRN | Mouvement de la Reconstruction Nationale (French: Movement for National Reconstruction, Haiti) | 国家重建运动（法语：海地国家重建运动） |
| MRN | Movement Request Number | 移动请求编号 |
| MRN | Mobile Robot Navigation | 移动机器人导航 |
| MRN | Manufacturers Reference Number | 制造商参考号 |
| MRN | Material Receiving Note | 材料接收单 |
| MRN | Manufacturers Resource Network | 制造商资源网络 |
| MRN | Material Return Note | 退料单 |
| MRN | Missions Resource Network (Bedford, TX) | 任务资源网络（德克萨斯州贝德福德） |
| MRN | Motor Racing Network | 赛车网络 |
| MRN | MatiÈres Radioactives Naturelles | MatiÈres Radioactives Naturelles |
| MRN | Magnetic Resonance Neurography | 磁共振神经造影 |
| MRN | Meteorological Rocket Network | 气象火箭网络 |
| MRN | Medical Record Number | 病历号 |
| MRN | malignant renal neoplasm | 恶性肾肿瘤 |
| MRN | Morgue Reference Number | 莫格参考号 |