| Acronym | Meaning |
 | PA/CCC | Payload Accommodations/Carrier Control Center |
| PAC | Polar Atmospheric Chemistry |
| PACDEX | PACific Dust EXperiment |
| PACE | Precipitation Augmentation For Crops Experiment |
| PACEM | Physics And Chemistry Of Earth Materials |
| PACJET | Pacific Land-falling Jets Experiment |
| PACLAT | Pacific Latitudinal Distribution Of Photochemical Trace Species |
| PACS | Pan-American Climate Studies |
| PACT | Professional Association Of Computing And Technology |
| PACX | Private Automatic Computer Exchange |
| PAGE | Program For The Advancement Of Geoscience Education |
| PAGES | Past Global Changes |
| PAIR | Particulate Airborne Inlet Research |
| PAKIT | Photochemistry And Kinetics Of Important Trace Gases |
| PALE | Paleoclimates From Arctic Lakes And Estuaries |
| PAM | Portable Automated Mesonet |
| PAM-III | Portable Automated Mesonet Station |
| PAN | Peroxyacyl Nitrates |
| PAN-CIMS | PAN Chemical Ionization Mass Spectrometer |
| PAR | Performance Assurance Requirements |
| PAR | Photosynthetically Active Radiation |
| PARS | Paralleled-processing Applied Research Systems |
| PAS | Platform Analysis System |
| PASE | Polar Air-Show Experiment |
| PASIN | Particle-Matter Airborne Sampling Inlet Experiment |
| PASJ | Publications Of The Astronomical Society Of Japan |
| PASSCAL | Program For Array Seismic Studies Of The Continental Lithosphere |
| PAWS | Psychological |
| PB | Product Of Polarization And Brightness |
| PBL | Planetary Boundary Layer |
| PBYTE | Petabyte (1015bytes) |
| PC | Geomagnetic Pulsations |
| PC | Continuous Pulsations |
| PC | Personal Computer |
| PCA | Physical Configuration Audit |
| PCAS | Passive Cavity Aerosol Spectrometer |
| PCAST | President's Council Of Advisers On Science And Technology |
| PCC | Profiler Control Center |
| PCC | Profiler Control Center |
| PCDS | Pilot Climate Data System |
| PCM | Parallel Climate Model |
| PCM | Pulse Code Modulation |
| PCM | Punched Card Machine |
| PCMDI | Program For Climate Model Diagnosis And Intercomparison |
| PCMS | Process And Change Management System |
| PCNFS | Personal Computer Network File System |
| PCO | Polar Cap Observatory |
| PCO | Polar Cap Observatory |
| PCRGA | Precipitation Chemistry |
| PCRGA | Precipitation Chemistry |
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