| National Bibliophile Society | Academic & Science |
| National Building Society | Academic & Science |
| National Broadcasting Society | Academic & Science |
| Next Bright Star | Academic & Science |
| NUS (National University of Singapore) Business School | Academic & Science |
| National Building Specification | Academic & Science |
| Network Based Statistic | Academic & Science |
| National Bureau of Statistics | Academic & Science |
| Natural and Behavioral Sciences | Academic & Science |
| Numismatic Bibliomania Society | Academic & Science |
| National Biological Survey | Academic & Science |
| National Blood Service | Associations & Organizations |
| Nehru Bal Sangh | Associations & Organizations |
| National Bankruptcy Services | Banking |
| Nelnet Business Solutions | Business |
| Northampton Business School | Business |
| National Business Systems | Business |
| Network Business Systems | Business |
| Navigator Business Solutions | Business |
| Net Business Solutions | Business |
| Nexbis Limited | Business |
| Nanyang Business School | Business |
| National Bank of Slovakia | Business |
| Nederland Binnenlandse Strijdkrachten | Business |
| N-bromosuccinimide | Chemistry |
| National Ballet School | Community |
| Nouvelle Bible Segond | Community |
| Net Broadcast Service | Computer and Networking |
| Network Based Solution | Computer and Networking |
| No Break Space | Computing |
| Network Buffers | Computing |
| Narrowband Socket | Computing |
| Network Boot Service | Computing |
| Network Border Switch | Computing |
| Network Based Services | Computing |
| National Broadcasting Service | Computing |
| Nsfnet Backbone Service | Computing |
| Numeric BackSpace | Computing |
| New BitShares | Cryptocurrency |
| National Bureau of Standards (now National Institute of Standards and Technology) | Electronics |
| Nothing But Signal | Electronics |
| National Benefits Services | General |
| New Building Standard | General |
| Nonpolarizing Beam Splitter | General |
| No Better Stationers | General |
| National Building Standard | General |
| Network Based Stratification | General |
| No Better Storage | General |
| Not Brems System | General |
| No Better Service | General |
| National Button Society | General |
| National Bankcard Systems | General |
| New Bike Syndrome | General |
| Normal But Simple | General |
| NBS abbreviation stands | General |
| Natural Born Smartor | General |
| New Body Style | General |
| National Budget System | General |
| Non Breaking Space | General |
| North Brisbane Suzuki | General |
| National Benefit Services | General |
| Nederland Binnenlandsche Strijdkrachten | General |
| Natural Born Spitters | General |
| National Bankcard Services | General |
| National Building Standards | General |
| National Beneficiary Survey | General |
| Node Bounded Search | General |
| Notebooks Because Some | General |
| Nature based solutions | General |
| Nucleotide Binding Site | General |
| Navigated Brain Stimulation | General |
| NEDSS Base System | General |
| Nand Building Service | General |
| National Bureau of Standards (1901?988) ( part of USDoC & now named NIST) | Governmental |
| National Electronic Disease Base System | Governmental |
| National Bureau of Standards (1901–1988) ( part of USDoC & now named NIST) | Governmental |
| National Broadcasting System | Governmental |
| NEW BANESWAR | Indian Railway Station |
| Not Being Serious | Internet |
| New Bicycle Surgery | Medical |
| Nijmegen breakage syndrome | Medical |
| Nijmegen Biomedical Study | Medical |
| Newborn Blood Spot | Medical |
| Normal Bowel Sounds | Medical |
| Normal Breath Sounds | Medical |
| Networked Business Solutions | Networking |
| National Bureau of Standards | Space Science |
| Neutral Buoyancy Simulator | Space Science |
| Nascar Busch Series | Sports |
| National Brotherhood of Skiers | Sports |
| Nation's Best Sports | Sports |
| Nelson Baseball School | Sports |
