| National Air Monitoring Station | Academic & Science |
| North American Monsoon System | Academic & Science |
| North American Menopause Society | Academic & Science |
| New Anglican Missionary Society | Academic & Science |
| North American Micropaleontology Society | Academic & Science |
| North American Membrane Society | Academic & Science |
| Novice to Advanced Marketing System | Business |
| Native American Management Services | Business |
| NASA Access Management System | Business |
| Niche Affiliate Marketing Systems | Business |
| Niche Affiliate Marketing System | Business |
| North Attleborough Middle School | Community |
| North Asheboro Middle School | Community |
| North Arlington Middle School | Community |
| National Association of Marine Services | Community |
| Nazareth Area Middle School | Community |
| North Andover Middle School | Community |
| Neil Armstrong Middle School | Community |
| National Association of Marine Surveyors | Community |
| North Albany Middle School | Community |
| North Augusta Middle School | Community |
| New Albany Middle School | Community |
| Network Attached Media Server | Computing |
| Network Analysis and Management System | Computing |
| North American Micropaleontology Section | General |
| National Agricultural Monitoring System | General |
| National Air Mobility System | Governmental |
| non Asian minorities Asians | International |
| National Association of Medical Schools | Medical |
