| PPS | Pulses Per Second | In English | |
| PPS | Primary Propulsion System | In English | → Vehicle engineering |
| PPS | Payload Pointing System | In English | |
| PPS | Pneumatic Power Subsystem | In English | |
| PPS | Partial-Pressure Suit | In English | → Spaceflight engineering, astronautics |
| PPS | Provisioning Performance Schedule | In English | |
| PPS | Product Performance System | In English | |
| PPS | Proceedings of the Physical Society | In English | → Serial publications, periodicals → Physics |
| PPSL | Proceedings of the Physical Society of London | In English | → Serial publications, periodicals → Physics |
| PPSL | Program Parts Selection List | In English | → Maintenance and logistics |
| PPT | Prelaunch Package Test | In English | |
| PPTE | Periodica Polytechnica Transportation Engineering | In English | → Serial publications, periodicals → Vehicle engineering → Transport and postal services |
| PPTEn | Polymer-Plastics Technology and Engineering | In English | → Serial publications, periodicals → Chemical technology → Plastic industry |
| PQA | Procurement Quality Assurance | In English | → 34745 |
| PQC | Procurement Quality Control | In English | → 34745 |
| PQC | Product Quality Council | In English | → Quality management |
| PQE | Procurement Quality Engineering | In English | → 34745 |
| PQE | Progress in Quantum Electronics | In English | → Serial publications, periodicals → Physics → Electronics |
| PQFP | Plastic Quad Flat Pack | In English | → Electronics |
| PQGS | Propellant Quantity Gauging System | In English | → Spaceflight engineering, astronautics |
| PQIC | Productivity and Quality Improvement Council | In English | → Quality management |
| PQIC | Product Quality Improvement Council | In English | → Quality management |
| PQT | Preliminary Qualification Test | In English | |
| PR | Pulse Rate | In English | |
| PR | Procurement Regulation | In English | → 34745 |
| PR | Problem Report | In English | |
| PR | Pressure Regulator | In English | |
| PR | Program Requirement | In English | |
| PR | Purchase Request | In English | → 34745 |
| PR | Performance Report | In English | |
| PR | Position Record | In English | |
| PR | Pressure Ratio | In English | |
| PR | Public Relations = RP | Relations Publiques | In French = RP | Relations Presse | In French |
In English | → Public relations |
| PRA | Participatory Rural Appraisal | In English | → Agricultural sciences |
| PRA | Precession Axis | In English | |
| PRA | Professional Rugby Players Association | In English | → Associations → Football and rugby |
| PrAA | Progress in Astronautics and Aeronautics | In English | → Serial publications, periodicals → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PRACA | Problem Reporting And Corrective Action | In English | |
| PrAeS | Progress in Aerospace Sciences | In English | → Serial publications, periodicals → Astronomy → Aeronautics, aircraft → 6297 |
| PRAI | Pattern Recognition and Artificial Intelligence | In English | → Software |
| PrAst | Practical Astronomy | In English | → Serial publications, periodicals → Astronomy |
| PRB | Program Requirements Baseline | In English | → Management |
| PRB | Program Review Board | In English | → Management |
| PRB | Panel Review Board | In English | |
| PRB | Parachute Refurbishment Building | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PRCB | Program Requirements Change Board | In English | → Management |
| PRCB | Program Requirements Control Board | In English | → Management |
| PRCB | Program Review Control Board | In English | → Management |
| PRCBD | Program Requirements Control Board Directive | In English | → Management |
| PRCO | Publications of the Riverview College Observatory | In English | → Serial publications, periodicals → Astronomy |
| PRCS | Primary Reaction Control System | In English | |
| PRD | Payload Requirements Document | In English | |
| PRD | Personal Radiation Dosimeter | In English | |
| PRD | Program Requirements Document | In English | → Management |
| PRD | Preliminary Requirements Document | In English | |
| PRD | Procurement Regulation Directive | In English | → 34745 |
| PRD | Procurement Requirements Document | In English | → 34745 |
| PRD | Project Requirements Document | In English | → Management |
| PRDA | Program Research and Development Announcement | In English | → Research policy → Engineering, technology |
| PRDLA | Pacific Rim Digital Library Alliance | In English | → Libraries → Organizations and associations |
| PRE | Personal Rescue Enclosure | In English | |
| PRE | Power Regulation Equipment | In English | → Electrical engineering |
| PrECS | Progress in Energy and Combustion Science | In English | → Serial publications, periodicals → Thermodynamics |
| PREMIA | Pattern Recognition and Machine Intelligence Association | In English | → Associations → Artificial intelligence → Computer-based techniques |
| PreR | Precambrian Research | In English | → Serial publications, periodicals → Palaeontology |
| PRESCO | Practical Recommendations for Sustainable Construction | In English | → Building |
| PRESENCCIA | Presence & Research Encompassing Sensory Enhancement, NeuroScience, Cerebral-Computer Interfaces and Applications | In English | |
| PREST | Policy Research in Engineering, Science and Technology | In English | → Politics → Mathematics and natural sciences → Applied sciences, technology |
| PrEx | Propellants and Explosives | In English | → Serial publications, periodicals → Vehicle engineering |
| PrExP | Propellants and Explosives Pyrotechnics | In English | → Serial publications, periodicals → Vehicle engineering |
| PRF | Pulse Repetition Frequency | In English | → Telecommunications |
| PRI | Primary Rate Interface | In English | → Telecommunications |
| PRIDE | Pacific Regional Initiatives for the Delivery of basic Education | In English | |
| PRIM&R | Public Responsibility In Medicine and Research | In English | → Research policy → Medicine |
| PRIME | Privacy and Identity Management for Europe | In English | |
| PRIP | Pattern Recognition and Image Processing | In English | → Graphical processing → Image processing |
| PRIS | Payload Remote Integration System | In English | |
| PRISCILLA | Bus PRiority strategies and Impact SCenarIos deveLoped on a Large urban Area | In English | → Transport and postal services |
| PRISM | Process Industries Safety Management | In English | → Engineering, technology |
| PRISM | Pacific Regional Information SysteM | In English | → Computer science → Telecommunications |
| PRISM | Pacific Roundtable on Industry, Society and Management | In English | → Management → Social sciences → Economics |
| PRisMa | Portfolio Risk Management | In English | → Management |
| PRISMATICA | Pro-active Integrated Systems for Security Management by Technological Institutional and Communication Assistance | In English | |
| PRL | Priority Rate Limiting | In English | |
| PRL | Payload Retention Latch | In English | |
| PRL | Page Revision Log | In English | |
| PRLA | Payload Retention Latch Actuator | In English | |
| PRLA | Payload Retention Latch Assembly | In English | |
| PRM | Performance and Reliability Module | In English | |
| PRM | Pulse Rate Modulation | In English | |
| PRM | Posigrade Rocket Motor | In English | → Spaceflight engineering, astronautics |
| PRM | Pocket Radiation Meter | In English | |
| PRM | Payload Retention Mechanism | In English | |
| PrMS | Progress in Materials Science | In English | → Serial publications, periodicals → Materials science |
| PRN | Program Release Notice | In English | |
| PRN | Pseudorandom Noise | In English | |
| PRN | Pulse Ranging Navigation | In English | |
| PRO | Planning Resident Order | In English | |
| PRO | Planning and Reporting Officers | In English | → Management |
| PROACT | Programme for Advanced Contactless Technology | In English | → Applied sciences, technology |
| PrOce | Progress in Oceanography | In English | → Serial publications, periodicals → Marine research, oceanography |
| PROE | Publications of the Royal Observatory of Edinburgh | In English | → Serial publications, periodicals → Astronomy |
| PROFETAS | Protein Foods, Environment, Technology and Society | In English | → Food technology |
| PROFS | Professional Office Systems | In English | |
| PROGRESS | Programme for Research on Embedded Systems & Software | In English | → Software → Electronics |
| PROM | Programmable Read-Only Memory | In English | → Memories |
| PROMIS | Project-Oriented Management Information System | In English | → Management → Knowledge management |
| ProTon | Public Research Organisations Transfer Office Network | In English | → Research policy → Engineering, technology |
| PRP | Program Redefinition Proposal | In English | |
| PRP | Personnel Reliability Program | In English | → Personnel management |
| PrPh | Progress of Physics | In English | → Serial publications, periodicals → Physics |
| PrPNP | Progress in Particle and Nuclear Physics | In English | → Serial publications, periodicals → Nuclear, atomic, and molecular physics |
| PRPS | Programming Requirements Process Specification | In English | → Software |
| PRR | Program Requirements Review | In English | → Management |
| PRR | Project Requirements Review | In English | → Management |
| PRR | Pulse Repetition Rate | In English | → Telecommunications |
| PRR | Production Readiness Review | In English | → Maintenance and logistics |
| PRR | Parts Replacement Request | In English | → Maintenance and logistics |
| PRR | Parts Rework or Replacement | In English | → Maintenance and logistics |
| PRR | Preflight Readiness Review | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PRR | Preliminary Requirements Review | In English | → Management |
| PRRB | Payload Requirements Review Board | In English | |
| PRS | Primary Rescue Site | In English | |
| PRS | Provisioning Requirements Statement | In English | |
| PRS | Primary Recovery Site | In English | |
| PRS | Preliminary Requirements Specification | In English | → Management |
| PRS | Precision Ranging System | In English | |
| PRS | Personal Rescue System | In English | |
| PRS | Personnel Rescue Service | In English | |
| PRS | Payload Retention System | In English | |
| PRS | Power Reactant Subsystem | In English | → Chemicals |
| PRSA | Power Reactant Storage Assembly | In English | → Chemicals |
| PRSC | Poverty Reduction Support Credit | In English | → Finance → Development |
| PRSD | Power Reactant Storage and Distribution | In English | → Chemicals |
| PRSDS | Power Reactant Storage and Distribution System | In English | → Chemicals |
| PRSS | Problem Report Squawk Sheet | In English | |
| PrSS | Progress In Surface Science | In English | → Serial publications, periodicals |
| PRSV | Papaya Ringspot Virus | In English | → Virology → Agricultural sciences |
| PRT | Pulse Repetition Time | In English | |
| PRTLS | Powered Return To Launch Site | In English | → Spaceflight engineering, astronautics |
| PRTR | Pollutant Release and Transfer Register | In English | → Nature and society → Environmental technology, water supply, waste management |
| PRV | Pressure-Reducing Valve | In English | |
| PrVP | Proceedings of Vibration Problems | In English | → Serial publications, periodicals → Acoustics |
| PS | Paging Systems | In English | |
| PS | Polystyrene | In English | → Plastic industry → Chemicals → Chemistry |
| PS | Pointing Subsystem | In English | |
| PS | Payload Support | In English | |
| PS | Primary Structure | In English | |
| PS | Parachute System | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PS | Production Sheet | In English | |
| PS | Payload Specialist | In English | |
| PS | Pressure Switch | In English | |
| PS | Payload Station | In English | |
| PS | Power Supply | In English | → Electrical engineering |
| PS | Probability of Survival | In English | |
| PS | PostScript | In English | → Programming languages → Document processing |
| PSA | Prabhu Dasi Sisters of Ajmeer | In English | → Roman catholic church |
| PSA | Poultry Science Association (www.poultryscience.org) | In English | → Associations → Zoology → Agricultural sciences |
| PSA | Power and Servoassembly | In English | → Mechanical engineering → Electrical engineering |
| PSA | Power Servoamplifier | In English | → Mechanical engineering → Electrical engineering |
| PSA | Power Switching Assembly | In English | → Mechanical engineering → Electrical engineering |
| PSA | Payload Service Area | In English | |
| PSA | Payload Support Avionics | In English | → Aeronautics, aircraft |
| PSA | Postsleep Activity | In English | |
| PSA | Preferred Storage Area | In English | |
| PSA | Presleep Activity | In English | → Medicine |
| PSA | Pressure Switch Assembly | In English | |
| PSA | Producibility, Supportability, and Affordability | In English | → Maintenance and logistics |
| PSA | Pacific Sociological Association | In English | → Associations → Sociology |
| PSAA | Philippines Studies Association Australasia | In English | → Associations → Language, linguistics, literature → Geography, biography, history |
| PSAC | Presidential Scientific Advisory Committee | In English | → Organizations and associations → Mathematics and natural sciences |
| PSB | (Singapore) Productivity and Standards Board | In English | → Standardization |
| PSBLS | Permanent Space-Based Logistics System | In English | → Maintenance and logistics → Spaceflight engineering, astronautics |
| PSC | Provide Station Control | In English | |
| PSC | Program Support Contractor | In English | |
| PSC | Program Support Center | In English | |
| PSC | Payload Support Contractor | In English | |
| PSC | Parallel Switch Control | In English | |
| PSC | Planetary Spacecraft | In English | → Spaceflight engineering, astronautics |
| PSC | Program Schedule Chart | In English | → Management |
| PSC | Pittsburgh Supercomputing Center | In English | → Computer science |
| PSCEC | Physical Sciences - Series of the Commission of European Communities | In English | → Serial publications, periodicals → Physics |
| PSCL | Propellant Systems Cleaning Laboratory | In English | → Research institutes → Spaceflight engineering, astronautics |
| PSCN | Program Support Communications Network | In English | → Networks, communication → Telecommunications |
| PSCN | Preliminary Specification Change Notice | In English | |
| PSCO | Philadelphia Seminar on Christian Origins | In English | → Christianity |
| PSCU | Power Supply Control Unit | In English | → Energy economics → Electrical engineering |
| PSD | Program Support Document | In English | |
| PSD | Power Systems Division | In English | → Energy economics → Electrical engineering |
| PSD | Power Spectral Density | In English | → Energy economics → Electrical engineering |
| PSD | Phase-Sensitive Demodulator | In English | |
| PSD | Physical Sciences Data | In English | → Serial publications, periodicals → Physics |
| PSDF | Propulsion System Development Facility | In English | → Vehicle engineering |
| PSDN | Packet Switched Data Network | In English | → Networks, communication |
| PSDP | Payload System Distribution Panel | In English | |
| PSDP | Payload Station Distribution Panel | In English | |
| PSDR | Planning and Scheduling Document Record | In English | → Management |
| PSDU | Power and Signal Distribution Unit | In English | → Energy economics → Electrical engineering → Telecommunications |
| PSE | Peculiar Support Equipment | In English | |
| PSE | Payload Service Equipment | In English |
|