| Abbreviation | Definition |
|---|---|
| NASDC | New American Schools Development Corporation |
| NASI | North American Scientific Inc |
| NASL | Nitol Aviation Services Ltd |
| NASP | National Association of Sales Professionals |
| NASP | National Association of Subrogation Professionals |
| NATC | Nevada Automotive Test Center |
| NATCO | Nehmeh Automotive Trading Company |
| NATCO | Nehmeh Automotive & Trading Company |
| NATG | North American TopGun |
| NATP | Novell Academic Training Partner |
| NAUA | North Atlanta Urology Associates |
| NAUC | North Atlanta Urgent Care |
| NAUG | NowAuto Group, Inc. |
| NAUGO | North American Urban Gear Originals |
| NAV | Naberhuis Artistic Venture |
| NavTech | Navigation Technologies Corporation |
| NAW | National Association of Wholesaler-Distributors |
| NAX | North American Express Transportation |
| NB | Natalie's Bunnies |
| NB | NationsBank |