| Acronym | Definition |
|---|
| NRU | Nauru (ISO Country code) |
| NRU | National Research Universal (a 200 MWt reactor at AECL's Chalk River Laboratories) |
| NRU | Nero Udf |
| NRU | Not Recently Used |
| NRU | Neighbourhood Renewal Unit (UK) |
| NRU | Neutral Red Uptake |
| NRU | Nederlandse Radio Unie |
| NRU | Northeast Rugby Union |
| NRU | Natural Rate of Unemployment (economics) |
| NRU | Neurobiology Research Unit |
| NRU | Nordic ReUnion (gaming group) |
| NRU | Nitrogen Rejection Unit |
| NRU | Nutritional Rehabilitation Unit |
| NRU | Nutrition Rehabilitation Unit |
| NRU | Newly Registered User (online forums) |
| NRU | Northwest Requirements Utilities |
| NRU | Nouveau Riche University (real estate) |
| NRU | Negative Reinforcement University |
| NRU | Niagara Rugby Union |
| NRU | Nursing Research Unit |
| NRU | Natural Resources Union (Canada) |
| NRU | Novae Res Urbis |
| NRU | Nuclear Radiation Unit |
| NRU | Neuro-Rehabilitation Unit |
| NRU | Network Repeater Unit |
| NRU | Net Results Unlimited (Columbus, Ohio) |
| NRU | Nutrient Response Units (land management) |