| Acronym | Definition |
|---|
| NNR➣National Nature Reserve (United Kingdom) |
| NNR➣Nishi-Nippon Railroad (Japan) |
| NNR➣Nearest Neighbor Rule (algorithm) |
| NNR➣National Nuclear Regulator (South Africa) |
| NNR➣Never Not Riding (cycling club) |
| NNR➣North Norfolk Railway (UK) |
| NNR➣Neuronal Nicotinic Receptor |
| NNR➣National Narcolepsy Registry |
| NNR➣Neb Neb Revolution (website) |
| NNR➣No Need to Respond (Internet slang) |
| NNR➣Naach Naach Revolution (dance competition) |
| NNR➣Navy Nonreporting |
| NNR➣Neural Network Review |