| P/B | Priority Playback | - | Business and Finance |
| P/L-EX | Payload Executive | - | Business and Finance |
| P/L-EX | Payload Executive | - | Business and Finance |
| PA | Position Angle | - | Business and Finance |
| PA | Payload Accommodations | - | Business and Finance |
| PA/CCC | Payload Accommodations/Carrier Control Center | - | Business and Finance |
| PAC | Polar Atmospheric Chemistry | - | Business and Finance |
| PACDEX | PACific Dust EXperiment | - | Business and Finance |
| PACE | Precipitation Augmentation For Crops Experiment | - | Business and Finance |
| PACEM | Physics And Chemistry Of Earth Materials | - | Business and Finance |
| PACJET | Pacific Land-falling Jets Experiment | - | Business and Finance |
| PACLAT | Pacific Latitudinal Distribution Of Photochemical Trace Species | - | Business and Finance |
| PACS | Pan-American Climate Studies | - | Business and Finance |
| PACT | Professional Association Of Computing And Technology | - | Business and Finance |
| PACX | Private Automatic Computer Exchange | - | Business and Finance |
| PAGE | Program For The Advancement Of Geoscience Education | - | Business and Finance |
| PAGES | Past Global Changes | - | Business and Finance |
| PAIR | Particulate Airborne Inlet Research | - | Business and Finance |
| PAKIT | Photochemistry And Kinetics Of Important Trace Gases | - | Business and Finance |
| PALE | Paleoclimates From Arctic Lakes And Estuaries | - | Business and Finance |
| PAM | Portable Automated Mesonet | - | Business and Finance |
| PAM-III | Portable Automated Mesonet Station | - | Business and Finance |
| PAN | Peroxyacyl Nitrates | - | Business and Finance |
| PAN-CIMS | PAN Chemical Ionization Mass Spectrometer | - | Business and Finance |
| PAR | Performance Assurance Requirements | - | Business and Finance |
| PAR | Photosynthetically Active Radiation | - | Business and Finance |
| PARS | Paralleled-processing Applied Research Systems | - | Business and Finance |
| PAS | Platform Analysis System | - | Business and Finance |
| PASE | Polar Air-Show Experiment | - | Business and Finance |
| PASIN | Particle-Matter Airborne Sampling Inlet Experiment | - | Business and Finance |
| PASJ | Publications Of The Astronomical Society Of Japan | - | Business and Finance |
| PASSCAL | Program For Array Seismic Studies Of The Continental Lithosphere | - | Business and Finance |
| PAWS | Psychological | - | Business and Finance |
| PB | Product Of Polarization And Brightness | - | Business and Finance |
| PBL | Planetary Boundary Layer | - | Business and Finance |
| PBYTE | Petabyte (1015bytes) | - | Business and Finance |
| PC | Geomagnetic Pulsations | - | Business and Finance |
| PC | Continuous Pulsations | - | Business and Finance |
| PC | Personal Computer | - | Business and Finance |
| PCA | Physical Configuration Audit | - | Business and Finance |
| PCAS | Passive Cavity Aerosol Spectrometer | - | Business and Finance |
| PCAST | President's Council Of Advisers On Science And Technology | - | Business and Finance |
| PCC | Profiler Control Center | - | Business and Finance |
| PCC | Profiler Control Center | - | Business and Finance |
| PCDS | Pilot Climate Data System | - | Business and Finance |
| PCM | Parallel Climate Model | - | Business and Finance |
| PCM | Pulse Code Modulation | - | Business and Finance |
| PCM | Punched Card Machine | - | Business and Finance |
| PCMDI | Program For Climate Model Diagnosis And Intercomparison | - | Business and Finance |
| PCMS | Process And Change Management System | - | Business and Finance |
| PCNFS | Personal Computer Network File System | - | Business and Finance |
| PCO | Polar Cap Observatory | - | Business and Finance |
| PCO | Polar Cap Observatory | - | Business and Finance |
| PCRGA | Precipitation Chemistry | - | Business and Finance |
| PCRGA | Precipitation Chemistry | - | Business and Finance |
| PCWG | Polar Climate Working Group | - | Business and Finance |
| PD | Positive Definite | - | Business and Finance |
| PD | Positive Definite | - | Business and Finance |
| PDAM | Point Data Access And Management | - | Business and Finance |
| PDE | Partial Differential Equation | - | Business and Finance |
| PDF | Probability Density Functions | - | Business and Finance |
| PDL | Program Design Language | - | Business and Finance |
| PDM | Pulse Duration Modulation | - | Business and Finance |
| PDM | Pulse Duration Modulation | - | Business and Finance |
| PDR | Preliminary Design Review | - | Business and Finance |
| PDS | Planetary Data System | - | Business and Finance |
| PDS | Platform Data System | - | Business and Finance |
| PDT | Product Development Team | - | Business and Finance |
| PDU | Power Distribution Unit | - | Business and Finance |
| PDU | Protocol Data Unit | - | Business and Finance |
| PDW | Preliminary Design Walk-through | - | Business and Finance |
| PE | Primitive Equation | - | Business and Finance |
| PE | Payload Executive | - | Business and Finance |
| PEACE | DOD Atoll-drilling Program For Coral Core Sample | - | Business and Finance |
| PEATMOS | Primitive Equation And Trojectory Model Output Statistics | - | Business and Finance |
| PEC | Performance Management Committee | - | Business and Finance |
| PECASE | Presidential Early Career Award For Scientists And Engineers | - | Business and Finance |
| PEL | Photo-electron Layer | - | Business and Finance |
| PELTI | Passing Efficiency For The Low Turbulence Inlet | - | Business and Finance |
| PEM | Particle Environment Monitor | - | Business and Finance |
| PEM | Pacific Exploratory Measurements | - | Business and Finance |
| PEM | Pacific Exploratory Mission | - | Business and Finance |
| PEP | Photo-electron Plasma | - | Business and Finance |
| PEPPI | Photometric Eclipse Polar Plume Imager | - | Business and Finance |
| PERFMON | Performance Monitor Utility | - | Business and Finance |
| PERL | Practical Extraction And Report Language | - | Business and Finance |
| PERT | Performance Evaluation And Review Technique | - | Business and Finance |
| PETA | People For The Ethical Treatment Of Animals | - | Business and Finance |
| PETS | Performance Evaluation And Test System | - | Business and Finance |
| PF | Performance Factor | - | Business and Finance |
| PFA | Prime Factor Algorithm | - | Business and Finance |
| PFA | Primary Flux Array | - | Business and Finance |
| PFS | Physical Facilities Service(s) | - | Business and Finance |
| PFU | Proto Flight Unit | - | Business and Finance |
| PGGA | Permanent GPS Geodetic Array | - | Business and Finance |
| PGS | Product | - | Business and Finance |
| PHIGS | Programmer's Hierarchical Interactive Graphics System | - | Business and Finance |
| PHIGS | Portable Hierarchical Image And Graphic Standard | - | Business and Finance |
| PHOXA | Photochemical Oxidant And Acid Deposition Model Application | - | Business and Finance |
| PHS | Public Health Service | - | Business and Finance |
