NIRS
| Acronym | Definition |
|---|---|
| NIRS | Near Infrared Spectroscopy |
| NIRS | Near-Infrared Reflectance Spectroscopy |
| NIRS | Nuclear Information and Resource Service |
| NIRS | National Institute on Retirement Security (Washington, DC) |
| NIRS | National Institute of Radiological Science |
| NIRS | Noise Integrated Routing System (aviation) |
| NIRS | National Information and Reporting System |
| NIRS | National Informatics Recognition System |
| NIRS | National Irrigation Research Station (Zambia) |
| NIRS | Navy Implementation for Raster Scanning |