NIRB
| Acronym | Definition |
|---|---|
| NIRB | Nunavut Impact Review Board (regulatory board; Canada) |
| NIRB | Nith Inshore Rescue Boat (UK) |
| NIRB | Nevada Institutional Review Board |
| NIRB | New in Retail Box (auction websites) |
| NIRB | Near Infrared Background |
| NIRB | NIMA-IMINT Review Board |