| Abbreviation | Definition |
|---|---|
| NOGS | New Orleans Geological Society |
| NOMMMA | National Ornamental Metal and Miscellaneous Metals Association |
| NORA | National Oil heat Research Alliance |
| NORA | Northeast Organized Racing Association |
| NOSA | National Occupational Safety Association |
| NOVA | Nurses Organization of Veterans Affairs |
| NPA | National Particleboard Association |
| NPA | National Pharmacists' Association |
| NPCA | National Paint and Coatings Association |
| NPDA | National Private Duty Association |
| NPDP | New Product Development Professional |
| NPG | Nageswar Patra Group |
| NPGA | National Propane Gas Association |
| NPIA | National Pet Insurance Association |
| NPLC | National Pedigreed Livestock Council |
| NPMA | National Property Management Association |
| NPPA | National Press Photographers Association |
| NPPC | National Pork Producers Council |
| NPPE | National Professional Practice Examination |
| NPRA | National Petrochemical And Refiners Association |