| National Safety Science Campaign | Academic & Science |
| Neighborhood Student Success Collaborative | Academic & Science |
| Nuclear Security Support Centres | Academic & Science |
| National Space Science Center | Academic & Science |
| Nuclear Science and Security Consortium | Academic & Science |
| NOAO System Science Center | Academic & Science |
| National Science Seminar Complex | Academic & Science |
| NAPCO Security Technologies, Inc. | Business |
| Nuclear Security Services Company | Business |
| Nul System Services Corporation | Business |
| Namibian Senior Secondary Certificate | Business |
| Namibia Senior Secondary Certificate | Business |
| Neutral Sulfite Semi-chemical | Chemistry |
| National Student Show and Conference | Community |
| National Safety and Security Council | Community |
| North Shore Senior Center | Community |
| National Senior Service Corps | Community |
| North State Shooting Club | Community |
| National Student Success Conference | Community |
| North Springfield Swim Club | Community |
| North Shore Swim Club | Community |
| North Scottsdale Soccer Club | Community |
| National Strategy to Secure Cyberspace | Computing |
| National Student Services Contact | Contact |
| National Soil Survey Center | Earth Science |
| National Shore Sales Challenge | General |
| Newhaven and Seaford Sailing Club | General |
| North Star Sail Club | General |
| National Supply Service Center | General |
| National Sustainable Structures Center | General |
| Natick Soldier Systems Center | General |
| Nova Scotia Supreme Court | Governmental |
| National Skills Standards Council | Governmental |
| Naval Submarine Support Command | Governmental |
| National Security Studies Course | Governmental |
| National Standards Strategy Committee | Governmental |
| National School Safety Center | Governmental |
| Naval Sea Systems Command (non-standard) | Military and Defence |
| Nasa Shared Services Center | Space Science |
| Nasa Standard Spacecraft Computer | Space Science |
