| Abbreviation | Definition |
|---|---|
| NTMA | National Terrazzo and Mosaic Association |
| NTMN | New Talent Management Network |
| NTPA | National Tractor Pullers Association |
| NTSA | National Tuberous Sclerosis Association |
| NTSA | Nnational Training Systems Association |
| NUNSO | National Union of Nuclear Security Officers |
| NUSDE | National Union of Shop and Distributive Employees |
| NUSJ | NetBSD Users' Society Japan |
| NVA | National Vinyl Association |
| NVAR | Northern Virginia Association of Realtors |
| NVDS | Northern Virginia Dental Society |
| NWEMC | National Workplace Emergency Management Center |
| NWEN | North West Europe and Nordics |
| NWG | Nurses Working Group |
| NWMA | National Woodwork Manufacturers Association |
| NWSA | National Womens Studies Association |
| NWWDA | National Wood Window and Door Association |
| NYAM | New York Academy of Medicine |
| NYEA | New York Electrolysis Association |
| NYLE | Northeastern Young Lumber Executives |