| Abbreviation | Definition |
|---|---|
| NAAA | Naval Academy Athletic Association |
| NAACL | National Assessments of Adult Literacy |
| NAACP | National Association for the Advancement of Colored People |
| NAACPLDEF | National Association for the Advancement of Colored People Legal Defense and Education Fund |
| NAACPSCF | National Association for the Advancement of Colored People Special Contribution Fund |
| NAAF | National Alopecia Areata Foundation |
| NAAF | Native American Alliance Foundation |
| NAAFA | National Association To Advance Fat Acceptance |
| NAAM | North American Alumni Meet |
| NAAMA | National Association Of Ancient And Medieval Arts |
| NAANSD | National Association of Anorexia Nervosa and Associated Disorders |
| NAAR | National Alliance for Autism Research |
| NAARS | Nottingham Anti-Animal Racing Society |
| NAAWP | National Advancement Association of White People |
| NAAWP | National Association for the Advancement of White People |
| NAB | National Aquarium in Baltimore |
| NABCI | North American Bird Conservation Initiative |
| NABSW | National Association of Black Social Workers |
| NABV | National Association for Black Veterans |
| NAC | National Accreditation Council |