NIRT
| Acronym | Definition |
|---|---|
| NIRT | Northamptonshire Ironstone Railway Trust (UK) |
| NIRT | Nanoscale Interdisciplinary Research Teams |
| NIRT | National Incident Response Team (Federal Reserve System) |
| NIRT | Nuclear Incident Response Team (US DHS) |
| NIRT | National Iranian Radio Television |
| NIRT | Network Infrastructure Release Testing (Cingular) |
| NIRT | National Inquiry Response Team |