| Abbreviation | Definition |
|---|---|
| NMUF | New Media United Foundation |
| NMYC | National Manpower and Youth Council |
| NMYC | North of McKnight Youth Council |
| NN | Narcolepsy Network |
| NN | Nurturing Network |
| NNAWM | National Native American Wellbriety Month |
| NNB | Nonprofit Networks Boston |
| NNFF | National NeuroFibromatosis Foundation |
| NNG | National Network of Grantmakers |
| NNI | Narcolepsy Network, Inc. |
| NNP | New Netherland Project |
| NNPDF | National Niemann- Pick Disease Foundation |
| NNPDF | National Niemann-Pick Disease Foundation |
| NNPN | Neighbor to Nation/ PledgeNet |
| NNR | Northwest Nonprofit Resources |
| NNSC | Network of Nonprofit Search Consultants |
| NOCC | National Ovarian Cancer Coalition |
| NOCF | National Ovarian Cancer Foundation |
| NOCRC | National Ovarian Cancer Resource Center |
| NOD | National Organization on Disability |