| NIRT | Nanoscale Interdisciplinary Research Team 
| Others |
| NIRT | Nanotechnology Interdisciplinary Research Teams
| Others |
| NIRT | National Incident Response Team
| Others |
| NIRT | National Institute for Relationship Training
| Others |
| NIRT | National Institute for Research in Tuberculosis
| Others |
| NIRT | National Institutional Reimbursement Team
| Others |
| NIRT | National Iranian Radio and Television
| Others |
| NIRT | Northamptonshire Ironstone Railway Trust
| Others |
| NIRT | Nri Institute Of Research Technology
| Others |
| NIRT | Nuclear Incident Response Team
| Others |