| Abbreviation | Definition |
|---|---|
| NSF | National Schizophrenia Foundation |
| NSF | National Scoliosis Foundation |
| NSF | National Sleep Foundation |
| NSF | Naval Services Familyline |
| NSFA | National School Foundation Association |
| NSFG | National Survey of Family Growth |
| NSFL | Navy Services FamilyLine |
| NSG | National Society for Histotechnology |
| NSH | National Society For Histotechnology |
| NSI | National Science Institute |
| NSIE | National Safety Information Exchange |
| NSMH | National Society of Minorities in Hospitality |
| NSN | Nonprofit Solutions Network |
| NSN | Nutrition Society of Nigeria |
| NSO | Nurse Service Organization |
| NSP | Nonprofit Support Program |
| NSPCC | National Society for the Prevention of Cruelty to Children |
| NSS | Nair Service Society |
| NSS | Namibia Scientific Society |
| NSS | National Space Society |