| Abbreviation | Definition |
|---|---|
| NPHF | Nederlandse Public Health Federatie |
| NPHF | Netherlands Public Health Federation |
| NPOS | New Plymouth Operatic Society |
| NPOS | North Pacific Orthopaedic Society |
| NPPS | North Pacific Pediatric Society |
| NPSO | Native Plant Society of Oregon |
| NPSS | Nature Photographic Society Singapore |
| NPSS | Nuclear Plasma Science Society |
| NPST | Native Plant Society of Texas |
| NRAS | National Rheumatoid Arthritis Society |
| NRBS | Northeast Region Biofeedback Society |
| NRBS | Northeast Regional Biofeedback Society |
| NRCS | National Red Cross/Crescent Societies |
| NRCS | Nepal Red Cross Society |
| NRCS | Nigerian Red Cross Society |
| NRDS | Noakhali Rural Development Society |
| NRHS | National Railway Historical Society |
| NRHS | Nomadic Railway Historical Society |
| NRPS | Nevada Recreation and Park Society |
| NRS | Nathaniel Rochester Society |