| Abbreviation | Definition |
|---|---|
| NATPE | The National Association Of Trade Programming Executives |
| NATS | National Association of Teachers of Singing |
| NATS | Nebraska Association of Teachers of Science |
| NATT | National Association of Teachers of Travellers |
| NATTB | National Apprentice Trade Testing Board |
| NAUA | National Automobile Underwriters Association |
| NAUB | National Association of Urban Bankers |
| NAUG | National AMS Users Group |
| NAUH | National Association of Urban Hospitals |
| NAUI | National Association of Underwater Instructors |
| NAVP | National Association of Veterinary Physiotherapists |
| NAVP | National Association of Vision Professionals |
| NAWB | National Association of Workforce Boards |
| NAWBO | National Association of Women Business Owners |
| NAWO | National Alliance of Women's Organisations |
| NAWO | National Association of Wedding Officiants |
| NAWT | National Association of Wastewater Transporters |
| NBA | National Bricklayers Association |
| NBAI | National Bar Association of India |
| NBAOT | New Brunswick Association of Occupational Therapists |