| Abbreviation | Definition |
|---|---|
| NPHL | National Public Health Laboratory |
| NPI | Non- Public Information |
| NPIC | National Passport Information Center |
| NPL | National Priorities List |
| NPL | National Priority List |
| NPO | National Preservation Office |
| NPP | Net Patronage Potential |
| NPP | Net Primary Productivity |
| NPP | Nuclear Power Plant |
| NPPES | National Plan & Provider Enumeration System (HHS) |
| NPR | National Partnership For Reinventing |
| NPR | National Press Release |
| NPR | Nothing To Provoke Rebellion |
| NPR | Notice of Proposed Rulemaking |
| NPRC | National Personnel Records Center |
| NPRG | National Partnership for Reinventing Government |
| NPS | Nuclear Power Station |
| NPSD | Network of Patient Safety Databases |
| NPT | (Nuclear) Non-proliferation Treaty |
| NPTO | National Petroleum Technology Office |