| Abbreviation | Definition |
|---|---|
| NAWO | North American Water Office |
| NAWT | National Animal Welfare Trust |
| NAWW | National Association of Working Women |
| NB | Nigeria Best |
| NBA | Narmada Bachao Andolan |
| NBA | National Benevolent Association |
| NBA | National Bison Association |
| NBA | National Braille Association |
| NBA | National Business Association |
| NBAB | Night Basketball and Books |
| NBAC | National Breastfeeding Awareness Campaign |
| NBCC | National Breast Cancer Coalition |
| NBCDI | National Black Child Development Institute |
| NBCDI-D | National Black Child Development Institute - Metropolitan Detroit |
| NBCF | National Breast Cancer Foundation |
| NBCTS | National Board for Professional Teaching Standards |
| NBDA | National Black Deaf Advocates |
| NBDC | National Business And Disability Council |
| NBEA | National Business Education Association |
| NBEA | New Bedford Educators Association |