| Abbreviation | Definition |
|---|---|
| NACO | National Aids Control Organization |
| NACOA | National Association for Children of Alcoholics |
| NACP | Nuclear Age Peace Foundation |
| NACS | North American Catalan Society |
| NACS | North American Community Service |
| NACT | National Association of Corporate Treasurers |
| NACTA | National Association Of Commissioned Travel Agents |
| NACU | National Association of CX Users |
| NACW | National Association of Colored Women |
| NAD | National Association for the Deaf |
| NADAC | North American Dog Agility Council |
| NADC | National Asian Deaf Congress |
| NADF | National Adrenal Diseases Foundation |
| NADF | Nishnawbe Aski Development Fund |
| NADF | Northern Aquaculture Demonstration Facility |
| NADFAS | National Association of Decorative and Fine Arts Societies |
| NADJ | National Association of Disc Jockeys |
| NADS | National Association for Down Syndrome |
| NADTA | North American Drama Therapy Association |
| NAEH | National Alliance to End Homelessness |