| Acronym | Definition |
|---|
| NIR | Near Infrared |
| NIR | Near-Infrared Radiation |
| NIR | Near-Infrared Reflectance |
| NIR | Natural Increase Rate (population) |
| NIR | National Identity Register (UK) |
| NIR | Near Infra Red |
| NIR | Network Information Registry |
| NIR | Near Infrared Response |
| NIR | Northern Ireland Railways |
| NIR | Net International Reserves |
| NIR | National Inventory Report |
| NIR | Non-Ionizing Radiation |
| NIR | National Internet Registry |
| NIR | Network Information Retrieval |
| NIR | New Industrial Relations (labor strategy) |
| NIR | National Institute of Research (various locations) |
| NIR | New Information Request (various organizations) |
| NIR | Name of Input Raster (computing) |
| NIR | New Inspection Regime (port state control) |
| NIR | National Institute of Development Research and Documentation (Botswana) |
| NIR | Net Interest Revenue |
| NIR | Net Irrigation Requirement |
| NIR | Navajo Indian Reservation |
| NIR | Nine Inch Richards (Nine Inch Nails parody band) |
| NIR | Numéro d'Identification au Répertoire National des Personnes Physiques Numéro d'Identification au Répertoire (French: Directory Identification Number) |
| NIR | No Individual Requirement |
| NIR | Non-Immediate Allergic-Type Reactions |
| NIR | New Item Request |