| Abbreviation | Definition |
|---|---|
| NIRI | Nutrition Intervention Research Initiative |
| NIRL | Neonatal Immunological Research Laboratory |
| NIRL | Neurocognition and Imaging Research Lab |
| NIRL | Neurocognitive and Imaging Research Lab |
| NIRL | Neuromuscular Imaging Research Laboratory |
| NIRL | Neuromuscular Immunopathology Research Laboratory |
| NIRP | National Inventory Research Project |
| NIRS | NTNU International Researcher Support |
| NIRT | Nanoscale Interdisciplinary Research Team |
| NIRT | National Institute for Research in Tuberculosis |
| NIRT | Nri Institute Of Research Technology |
| NISER | National Institute for STEM Evaluation and Research |
| NISER | National Institute of Science Education and Research |
| NISER | National Institute of Science Education Research |
| NISER | National Institute of Social and Economic Research |
| NISER | Nepal Institute for Social and Environmental Research |
| NISER | Nepal Institute For Social Environmental Research |
| NISER | Nigerian Institute for Social and Economic Research |
| NISER | Nigerian Institute of Social and Economic Research |
| NITR | National Institute of Toxicological Research |