| P | Pallet (Spacelab) | - | Organizations |
| P | Period | - | Organizations |
| P | Pilot | - | Organizations |
| P | Pitch | - | Organizations |
| P | Pole | - | Organizations |
| P | Pressure | - | Organizations |
| P | Primary | - | Organizations |
| P | Prime | - | Organizations |
| P | Roll Rate (Angular Rate) | - | Organizations |
| P&FS | Particles And Fields Subsatellite | - | Organizations |
| P&I | Performance And Interface (Specification) | - | Organizations |
| P&M | Performance Monitor | - | Organizations |
| P&M | Phase Modulation (Modulated) | - | Organizations |
| P&M | Planetary Mission | - | Organizations |
| P&M | Preventive Maintenance | - | Organizations |
| P&M | Processes And Materials | - | Organizations |
| P&M | Program Milestone | - | Organizations |
| P&M | Pulse Modulation | - | Organizations |
| P&R | Performance And Resources | - | Organizations |
| P&SM | Procurement And Subcontract Management | - | Organizations |
| P-P | Peak-to-Peak (Value) | - | Organizations |
| P-TUBE | Pneumatic Tube | - | Organizations |
| P/A | Problem Analysis | - | Organizations |
| P/B | Preburner | - | Organizations |
| P/B | Pushbutton | - | Organizations |
| P/C | Pitch Control | - | Organizations |
| P/L | Parts List | - | Organizations |
| P/L | Payload | - | Organizations |
| P/L | Postlanding | - | Organizations |
| P/L | Purchased Labor | - | Organizations |
| P/N | Part Number | - | Organizations |
| P/P | Patch Panel | - | Organizations |
| P/P | Printer/Plotter | - | Organizations |
| P/PL | Primary Payload | - | Organizations |
| P/S | Parallel To Serial Converters | - | Organizations |
| P/S | Payload Specialist | - | Organizations |
| P/Y | Pitch/Yaw | - | Organizations |
| PA | Pad Abort | - | Organizations |
| PA | Paging And Area Warning | - | Organizations |
| PA | Power Amplifier | - | Organizations |
| PA | Product Assurance | - | Organizations |
| PA | Public Address | - | Organizations |
| PA | Public Affairs | - | Organizations |
| PA | Pulse AmPlifier | - | Organizations |
| PAC | Pressure Alpha Center | - | Organizations |
| PAC | Probe Aerodynamic Center | - | Organizations |
| PAC | Problem Action Center | - | Organizations |
| PACAS | Personnel Access Control Accountability System | - | Organizations |
| PACC | Problem Action Control Center | - | Organizations |
| PACE | Prelaunch Automatic Checkout Equipment | - | Organizations |
| PACS | Pointing And Attitude Control System | - | Organizations |
| PAD | Preliminary Advisory Data (Crew Data Uplink) | - | Organizations |
| PAD | ProgramApprovalDocument | - | Organizations |
| PAD | Propellant Acquisition Device | - | Organizations |
| PAE | Preventive Action Engineer | - | Organizations |
| PAE | Problem Assessment Engineer | - | Organizations |
| PAF | Payload Attach Fitting | - | Organizations |
| PAF | Payload Attach Fitting | - | Organizations |
| PAF | Peak Annual Funding | - | Organizations |
| PAFB | Patrick Air Force Base | - | Organizations |
| PAH | PaYload Accommodations Handbook | - | Organizations |
| PAL | APA Indonesian Communications Satellite | - | Organizations |
| PALS | Photo Area And Location SYstem | - | Organizations |
| PALS | Precision Approach And Landing SYstem | - | Organizations |
| PAM | Payload Assist Module | - | Organizations |
| PAM | Payload Assist Module | - | Organizations |
| PAM | Pulse Amplifier Modulation | - | Organizations |
| PAM | Pulse Amplitude Modulation | - | Organizations |
| PAM-A | PAM | - | Organizations |
| PAM-D | PAM | - | Organizations |
| PAMB | Pressure Ambient | - | Organizations |
| PAO | Public Affairs Office (Officer) | - | Organizations |
| PAP | Product Assurance Plan | - | Organizations |
| PAPI | Precision Approach Path Indicator | - | Organizations |
| PAR | Planning Action Request | - | Organizations |
| PAR | Precision Approach Radar | - | Organizations |
| PAR | Problem Accountability Record | - | Organizations |
| PAR | Problem Action Record | - | Organizations |
| PAR | Problem Action Request | - | Organizations |
| PAR | Product Acceptance Review | - | Organizations |
| PARA | Paragraph | - | Organizations |
| PARAM | Parameter | - | Organizations |
| PARS | Property Accountability Record System | - | Organizations |
| PAS | Payload Accommodation Studies | - | Organizations |
| PAS | Primary Ascent System | - | Organizations |
| PASS | Planning And Scheduling System | - | Organizations |
| PASS | Primary Avionics Software System | - | Organizations |
| PASS | Primary Avionics Software System | - | Organizations |
| PAT | Problem Action Team | - | Organizations |
| PAT | Production Acceptance Test | - | Organizations |
| PATP | Preliminary Authority To Proceed | - | Organizations |
| PATS | Program For Analysis Of Time Series | - | Organizations |
| PAU | Probe Aerodynamic Upper | - | Organizations |
| PAV | Pressure Actuated Valve | - | Organizations |
| PAX | Passengers | - | Organizations |
| PAYCOM | Payload Command | - | Organizations |
| PAYDAT | Payload Data | - | Organizations |
| PB | Phonetically Balanced | - | Organizations |
| PB | Playback | - | Organizations |
| PB | Playback | - | Organizations |
