| NIR | Nosocomial infection rate | 医院感染率 |
| NIR | National Internet Registry | 国家级互联网注册管理机构 |
| NIR | Nota di Iscrizione a Ruolo | Ruolo Iscrizione标记 |
| NIR | Near Infra Red | 近红外 |
| NIR | New Intravascular Rigid | 新型血管内刚性 |
| NIR | Nirvana If Real | 涅盘若真 |
| NIR | National Institute of Development Research and Documentation | 国家发展研究与文献研究所 |
| NIR | Network Information Repository | 网络信息库 |
| NIR | Near Infrared Reflectance | 近红外反射率 |
| NIR | National Inventory Report | 国家库存报告 |
| NIR | Near-Infrared Reflectance | 近红外反射率 |
| NIR | Network Information Retrieval | 网络信息检索 |
| NIR | Non-Ionizing Radiation | 非电离辐射 |
| NIR | National Identity Register (UK) | 国家身份登记（英国） |
| NIR | Net Interest Revenue | 净利息收入 |
| NIR | Near Infrared | 近红外 |
| NIR | Navajo Indian Reservation | 纳瓦霍印第安人保留地 |
| NIR | Northern Ireland Railways | 北爱尔兰铁路 |
| NIR | National Institute of Development Research and Documentation (Botswana) | 国家发展研究和文献研究所（博茨瓦纳） |
| NIR | Net Irrigation Requirement | 净灌溉需求 |
| NIR | New Inspection Regime (port state control) | 新检查制度（港口国控制） |
| NIR | Non-Immediate Allergic-Type Reactions | 非即时过敏性反应 |
| NIR | No Individual Requirement | 非个人需要 |
| NIR | Nine Inch Richards (Nine Inch Nails parody band) | 九英寸理查兹（九英寸指甲戏仿乐队） |
| NIR | Net International Reserves | 国际储备净额 |
| NIR | Natural Increase Rate | 自然增长率 |
| NIR | Non Intrusive Reservation | 非侵入性预订 |