| Abbreviation | Definition |
|---|---|
| NAC | National Adoption Center |
| NAC | Naturist Action Committee |
| NACA | National AIDS Coordinating Agency |
| NACA | National Association for Children of Alcoholics |
| NACA | National Association of Chinese Americans |
| NACAC | National Association for College Admission Counseling |
| NACAC | North American Council on Adoptable Children |
| NACAC | The National Association Of College Admissions Counselors |
| NACASB | National Accreditation Council for Agencies Serving the Blind & Visually Handicapped |
| NACASBVH | National Accreditation Council for Agencies Serving the Blind & Visually Handicapped |
| NACC | National Alzheimers Coordinating Center |
| NACC | National Association For Colitis And Crohns |
| NACC | National Association of Catholic Chaplains |
| NACC | Non-profit Academic Centers Council |
| NACE | National Association of Corrosion Engineers |
| NACE | National Association of County Engineers |
| NACE | Niagara Association for Christian Education |
| NACHRI | National Association of Children's Hospitals and Related Institutions |
| NACMA | National Agricultural Commodities Marketing Association |
| NACME | National Action Council for Minorities in Engineering |