| Abbreviation | Definition |
|---|---|
| NPG | Nonunit Personnel Generator |
| NPG | Non-unit Personnel Generator |
| NPGS | Naval Post Graduate School |
| NPI | National Power Index |
| NPNI | Non Part-Numbered Item |
| NPOES | National Polar-orbiting Operational Environmental Satellite (Program) |
| NPOI | Navy Prototype Optical Interferometer |
| NPQ | Not Physically Qualified |
| NPR | Naval Projections Report |
| NPR | No Problem Reporting |
| NPR | Nuclear Posture Review |
| NPS | NATO Precautionary System |
| NPS | Nonprior Service |
| NPS | Nuclear Planning System |
| NPT | National Pipe Thread |
| NPT | Network Planning Terminal |
| NPT | Non- Proliferation Treaty |
| NPT | Non-Proliferation Treaty |
| NPT | Nuclear Power Training |
| NPT | Treaty On The Nonproliferation of Nuclear Weapons |