| Acronym | Meaning |
 | PAMB | Pressure Ambient |
| PAO | Public Affairs Office (Officer) |
| PAP | Product Assurance Plan |
| PAPI | Precision Approach Path Indicator |
| PAR | Planning Action Request |
| PAR | Precision Approach Radar |
| PAR | Problem Accountability Record |
| PAR | Problem Action Record |
| PAR | Problem Action Request |
| PAR | Product Acceptance Review |
| PARA | Paragraph |
| PARAM | Parameter |
| PARS | Property Accountability Record System |
| PAS | Payload Accommodation Studies |
| PAS | Primary Ascent System |
| PASS | Planning And Scheduling System |
| PASS | Primary Avionics Software System |
| PASS | Primary Avionics Software System |
| PAT | Problem Action Team |
| PAT | Production Acceptance Test |
| PATP | Preliminary Authority To Proceed |
| PATS | Program For Analysis Of Time Series |
| PAU | Probe Aerodynamic Upper |
| PAV | Pressure Actuated Valve |
| PAX | Passengers |
| PAYCOM | Payload Command |
| PAYDAT | Payload Data |
| PB | Phonetically Balanced |
| PB | Playback |
| PB | Playback |
| PB | Preburner (P/B Preferred) |
| PB | Pushbutton |
| PBAN | Polybutadiene Acrylonitrile (Propellant) |
| PBD | Payload Bay Door |
| PBDF | Payload Bay Door FWD |
| PBDM | Payload Bay Door Mechanism |
| PBI | Push Button Indicator |
| PBI | Push Button Indicator |
| PBIC | Programmable Buffer Interface Card |
| PBIM | Programmable Buffer Interface Module |
| PBK | Payload Bay Kit |
| PBL | Payload Bay Liner |
| PBM | Program Business Management |
| PBPS | Post-Boost Propulsion System(s) |
| PBS | Protective Breathing System |
| PBW | Proportional Band Width |
| PC | Chamber Pressure |
| PC | Chamber Pressure |
| PC | Pitch Control |
| PC | Plane Change |
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