| Abbreviation | Definition |
|---|---|
| NAHH | National Alliance for Hispanic Health |
| NAHHH | National Association of Hospital Hospitality Houses |
| NAHHHI | National Association of Hospital Hospitality Houses, Inc. |
| NAHREP | National Association of Hispanic Real Estate Professionals |
| NAHRS | North American Hair Research Society |
| NAI | Normandy Allies, Inc. |
| NAICA | Neighborhood Association for Inter-Cultural Affairs, Inc. |
| NAII | Nonprofit Arts Internship Initiative |
| NAL | National Assistance League |
| NALB | North American Liaison Board |
| NAMA | National American Metis Association |
| NAMBLA | North American Man Boy Love Association |
| NAMI | National Alliance for Mental Illness |
| NAMI | National Alliance on Mental Illness |
| NAMI | National Association for Mental Illness |
| NAMS | North American Menopause Society |
| NANA | National Alliance for Nutrition and Activity |
| NANBPWC | National Association of Negro Business and Professional Women's Clubs |
| NANI | National Alliance of Nonprofits for Insurance |
| NANPS | North American Native Plant Society |