| Abbreviation | Definition |
|---|---|
| PSAC | President's Science Advisory Council |
| PSC | Polar Science Center |
| PSC | Polar Stratospheric Cloud |
| PSC | Prohibited Species Catch |
| PSD | Position Sensitive Detector |
| PSF | Program Support Facility |
| PSI | Pacific Stratus Investigation |
| PSI | Pacific Sulfur Investigation |
| PSMP | Program on Short- and Medium-Range Weather Prediction Research |
| PSMSL | Permanent Service for Mean Sea Level |
| PSP | Paralytic Shellfish Poisoning |
| PSS | Practical Salinity Scale |
| PSU | Pennsylvania State University |
| PSV | Partial Sea View |
| PTA | Procrustes Target Analysis |
| PTAP | Profiler Triangle Analysis Package |
| PTC | Personnel Transfer Capsule |
| PTO | Patent and Trademark Office |
| PTT | Platform Transmitter Terminal |
| PTWC | Pacific Tsunami Warning Center |