| PSSP | Payload Specialist Station Panel | In English | |
| PSSR | Performance Status Summary Report | In English | → Management |
| PSSR | Performance Status Summary Review | In English | → Management |
| PSSS | Packet Scan Status Stack | In English | |
| PSST | Periodic Significant Scheduled Task | In English | → Management |
| PSST | Plasma Sources Science Technology | In English | → Serial publications, periodicals → Plasma physics |
| PSSU | Patch Survey and Switching Unit | In English | |
| PST | Preliminary Systems Test | In English | |
| PST | Point Source Transmittance | In English | |
| PST | Point Source Transmission | In English | |
| PSTL | Pressure Model Static and Transient Launch Configuration | In English | → Spaceflight engineering, astronautics |
| PSTN | Public Switched Telephone Network = RTCP | Réseau Téléphonique Commuté Public | In French = ТСОП | елефонная сеть общего пользования | In Russian |
In English | → Telecommunications |
| PSTS | Profile Specific Test Specificiation | In English | |
| PSU | Power Switching Unit | In English | → Energy economics → Electrical engineering |
| PSU | Pennsylvania State University (www.psu.edu) | In English | → Higher education, universities |
| PSV | Photographic Spatial Volume | In English | |
| PSV | Planetary Space Vehicle | In English | → Spaceflight engineering, astronautics |
| PSV | Probability of Vehicle Success | In English | → Spaceflight engineering, astronautics |
| PSW | Program Status Word | In English | |
| PSWWWVL | Pacific Studies WWW Virtual Library | In English | → Internet → Libraries → Area studies |
| PT | Project Team | In English | → Management |
| PT | Paper Tape | In English | |
| PT | Propulsion Test | In English | → Vehicle engineering |
| PT | Pneumatic Tube | In English | |
| PT | Primary Target | In English | |
| PT | Pressure Transducer | In English | |
| PT | Power Transfer | In English | → Energy economics |
| PT | Point of Tangency | In English | |
| PT | Part Task | In English | |
| PT | Product Team | In English | |
| PT | Productivity Team | In English | → Management |
| PTA | Propulsion Test Article | In English | → Vehicle engineering |
| PTA | Pointing and Tracking Assembly | In English | |
| PTA | Property Transfer Authorization | In English | |
| PTA | ParisTech Alumni (www.paristech-alumni.org) | In English | → Organizations and associations → Specialized or (poly)technical colleges |
| PTAN | Professional Teacher Associations Network | In English | → Organizations and associations → Education |
| PTAN | Preschool Technical Assistance Network | In English | → Education → Engineering, technology |
| PTAS | Performance Trend Analysis System | In English | → Management |
| PTB | Payload Timing Buffer | In English | |
| PTC | Portable Temperature Controller | In English | |
| PTC | Passive Thermal Conditioning | In English | |
| PTC | Plasma Thromboplastin Component | In English | → Blood and circulatory system → Pharmacology, toxicology |
| PTC | Pacific Theological College | In English | → Religion, theology → Specialized or (poly)technical colleges |
| PTC | Passive Thermal Control | In English | |
| PTCA | Percutaneous Coronary Transluminal Angioplasty | In English | → Cardiology |
| PTCC | Propulsion Test Control Center | In English | → Spaceflight engineering, astronautics |
| PTCP | Progress in Theoretical Chemistry and Physics | In English | → Serial publications, periodicals → Physics → Theoretical chemistry |
| PTCR | Pad Terminal Connection Room | In English | → Telecommunications |
| PTCS | Pointing, Tracking, and Control System | In English | |
| PTCS | Planning, Training, and Checkout System | In English | |
| PTCS | Passive Thermal Control System | In English | |
| PTCS | Propellant Tanking Computer System | In English | → Spaceflight engineering, astronautics |
| PTD | Preliminary Technical Directive | In English | → Engineering, technology |
| PTD | Provisioning Technical Documentation | In English | → Engineering, technology |
| PTE | Plate-forme Technologique Européenne | In English | → Engineering, technology |
| PTF | Physics of Thin Films | In English | → Serial publications, periodicals → Physics |
| PTH | Parathyroid Hormone | In English | → Hormones |
| PThPh | Progress of Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| PThPS | Progress of Theoretical Physics Supplement | In English | → Serial publications, periodicals → Physics |
| PTI | Preliminary Test Information | In English | |
| PTI | Programmed Test Input | In English | |
| PTIS | Programmed Test Input System | In English | |
| PTL | Potential Termination Liability | In English | |
| PTM | Pulse Time Modulation | In English | |
| PTO | Power Test Operation | In English | → Energy economics |
| PTP | Previously Treated Patient | In English | → Pharmacology, toxicology |
| PTPPB | Physics and Technology of Particle and Photon Beams | In English | → Serial publications, periodicals → Nuclear, atomic, and molecular physics |
| PTR | Program Trouble Report | In English | → Management |
| PTR | Program Technical Review | In English | → Management → Engineering, technology |
| PTR | Preliminary Test Report | In English | |
| PTS | Payload Test Set | In English | |
| PTS | Payload Transportation System | In English | → Vehicle engineering |
| PTS | Profile Test Specification | In English | |
| PTS | Pay Terminals & Systems | In English | |
| PTS | Profile Test Suite | In English | |
| PTSF | Payload Trunnion Support Fixture | In English | |
| PTU | Pan and Tilt Unit | In English | |
| PTV | Pathfinder Test Vehicle | In English | → Spaceflight engineering, astronautics |
| PU | Propellant Unit | In English | → Spaceflight engineering, astronautics |
| PU | Propellant Utilization | In English | → Spaceflight engineering, astronautics |
| PU | Power Unit | In English | → Energy economics → Electrical engineering |
| PU | Production Unit | In English | |
| PUAms | Publications of the Astronomical Institute of the University of Amsterdam | In English | → Serial publications, periodicals → Astronomy |
| PUCS | Propellant Utilization Control System | In English | → Spaceflight engineering, astronautics |
| PUFA | Polyunsaturated Fatty Acid | In English | → Biochemistry, biophysics |
| PUGS | Propellant Utilization and Gauging System | In English | → Spaceflight engineering, astronautics |
| PUKAR | Partners for Urban Knowledge Action & Research | In English | → Sociology |
| PUP | Previously Untreated Patient | In English | → Pharmacology, toxicology |
| PUS | Public Understanding of Science | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| PUSNO | Publications of the US Naval Observatory | In English | → Serial publications, periodicals → Astronomy |
| PUV | Propellant Utilization Valve | In English | → Spaceflight engineering, astronautics |
| PV | Photovoltaic | In English | → Energy economics |
| PVA | Propellant Valve Actuator | In English | → Spaceflight engineering, astronautics |
| PVA | Preburner Valve Actuator | In English | → Spaceflight engineering, astronautics |
| PVasO | Publications of the Vassar College Observatory | In English | → Serial publications, periodicals → Astronomy |
| PVC | Pressure-Volume Compensated | In English | |
| PVC | Permanent Virtual Circuit | In English | → Telecommunications |
| PVC | Polyvinyl Chloride | In English | → 665 |
| PVD | Purge, Vent, and Drain | In English | |
| PVD | Passive Vibration Damping | In English | |
| PVDC | Polyvinylidene Chloride | In English | → Plastic industry |
| PVDF | Polyvinylidenefluoride | In English | → Plastic industry → Chemicals → Chemistry |
| PVDS | Propellant Vent and Drain System | In English | → Spaceflight engineering, astronautics |
| PVED | Propulsion And Vehicle Engineering Division | In English | → Vehicle engineering |
| PVL | Periventricular Leukomalacia = PVL | Periventrikuläre Leukomalazie | In German = PVL | Periventriculaire Leukomalacie | In Dutch = LMPV | Leucomalacie périventriculaire | In French |
In English | → Obstetrics → Neurology |
| PVLA | Purchase Versus Lease Analysis | In English | → 33745 → Prices |
| PVMA | Pre-Veterinary Medical Association | In English | → Associations → Veterinary medicine |
| PVO | Pioneer Venus Orbiter | In English | → Astronomy → Spaceflight engineering, astronautics |
| PVO | Private Voluntary Organization | In English | → Organizations and associations |
| PVR | Precision Voltage Reference | In English | → Electrical engineering |
| PVR | Personal Video Recording | In English | → Cinema, movies |
| PVRD | Purge, Vent, Repressurize, and Drain | In English | |
| PVSS | Royal Astronomical Society of New Zealand, Publications of Variable Star Section | In English | → Serial publications, periodicals → Astronomy |
| PVT | Passive Visible Tracker | In English | |
| PVT | Pyrotechnic Verification Test | In English | → Spaceflight engineering, astronautics |
| PVT | Preflight Verification Test | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| PVT | Pressure, Volume, and Temperature | In English | |
| PVT | Psychomotor Vigilance Task | In English | |
| PVTCS | Photovoltaic Thermal Control System | In English | → Energy economics |
| PVTOS | Physical Vapor Transport Organic Solids | In English | |
| PVVO | Publications of the Van Vleck Observatory | In English | → Serial publications, periodicals → Astronomy |
| PVWA | Planned Value of Work Accomplished | In English | → Management |
| PVWS | Planned Value of Work Scheduled | In English | → Management |
| PW | Printed Wiring | In English | |
| PW | Plan Washer | In English | |
| PW | Pulse Width | In English | |
| PW&SO | Publications of the Warner Swasey Observatory | In English | → Serial publications, periodicals → Astronomy |
| PWA | Private Write Area | In English | → Memories |
| PWA | Pratt and Whitney Aircraft | In English | → Aeronautics, aircraft |
| PWA | Printed Wiring Assembly | In English | → Electronics |
| PWA | Product Work Authorization | In English | |
| PWasO | Publications of the Washburn Observatory | In English | → Serial publications, periodicals → Astronomy |
| PWB | Printed Wiring Board | In English | → Electronics |
| PWBS | Program Work Breakdown Structure | In English | |
| PWD | Proceed With Design | In English | |
| PWDS | Protected Wire Distribution System | In English | → Electrical engineering |
| PWGSC | Public Works and Government Services Canada (www.tpsgc-pwgsc.gc.ca) = TPSGC | Travaux Publics et Services Gouvernementaux Canada | In French |
In English | → Central administration → Civil engineering |
| PWHHO | Publications of West Hendon House Observatory | In English | → Serial publications, periodicals → Astronomy |
| PWHS | Public Works Historical Society | In English | → Organizations and associations → History |
| PWM | Pulse Width Modulation | In English | |
| PWMD | Printed Wiring Master Drawing | In English | → Electronics |
| PWR | Pressurized Water Reactor = REP | Réacteur à Eau Pressurisée | In French = DWR | Druckwasserreaktor | In German |
In English | → Nuclear technology |
| PWS | Pricing Work Statement | In English | → Prices |
| PWT | Propulsion Wind Tunnel | In English | → Vehicle engineering |
| PWTN | People's Watch - Tamil Nadu | In English | → Social sciences |
| PWW | Project West Wing | In English | |
| PYerO | Publications of the Yerkes Observatory | In English | → Serial publications, periodicals → Astronomy |
| PYunO | Publications of the Yunnan Observatory | In English | → Serial publications, periodicals → Astronomy |
| Q | Glutamine = Q | Glutamina | In Catalan = Q | Glutamin | In Czech = Q | Glutamin | In German = Q | Glutamina | In Spanish = Q | Glutamino | In Esperanto = Q | Glutamine | In French = Q | 글루타민 | In Korean = Q | Glutamin | In Indonesian = Q | Glutammina | In Italian = Q | גלוטמין | In Hebrew = Q | Glutamīns | In Latvian = Q | Glutamin | In Letzeburgesh = Q | Glutaminas | In Lithuanian = Q | Glutamine | In Dutch = Q | グルタミン | In Japanese = Q | Glutamina | In Polish = Q | Glutamina | In Portuguese = Q | Глутамин | In Russian = Q | Glutamín | In Slovak = Q | Глутамин | In Serbian = Q | Glutamiini | In Finnish = Q | Glutamin | In Swedish = Q | Glutamin | In Turkish = Q | Глутамін | In Ukrainian = Q | 穀氨醯胺 | In Chinese |
In English | → Biochemistry, biophysics |
| Q&A | Question and Answer | In English | → Science and knowledge |
| QA | Quality Audit | In English | → Quality management |
| QA | Quality Assurance | In English | → Quality management |
| QA&T | Quality Assurance and Test | In English | → Quality management |
| QAA | Quality Assurance Agency for Higher Education | In English | → Specialized or (poly)technical colleges → Higher education, universities |
| QAC | Quality Assurance Chart | In English | → Quality management |
| QACAD | QA Corrective Action Document | In English | |
| QAD | Quality Assurance Division | In English | → Quality management |
| QAFM | QA Forms Manual | In English | |
| QAM | QA Manual | In English | |
| QAM | Quadrature Amplitude Modulation | In English | → Telecommunications |
| QANTAS | Queensland And Northern Territories Airline System | In English | → Transport and postal services |
| QAOP | QA Operating Procedure | In English | |
| QAP | Quality Assurance Product | In English | → Quality management |
| QAP | QA Procedure | In English | |
| QAP | Quality Assessment Procedures | In English | → Quality management |
| QAPF | Quartz, Alkali feldspar, Plagioclase, Feldspathoid | In English | → Mineralogy → Petrology |
| QApMa | Quarterly of Applied Mathematics | In English | → Serial publications, periodicals → Mathematics |
| QAR | Quality Assurance Report | In English | → Quality management |
| QAVT | Qualification Acceptance Vibration Test | In English | |
| QBIC | Query By Image Content | In English | → Image processing |
| QC | Quality Control | In English | → Quality management |
| QCA | Quantum Cellular Automata | In English | |
| QCB | Queue Control Block | In English | |
| QCD | Quantum Chromodynamics | In English | → Physics |
| QCDR | QC Deficiency Report | In English | |
| QCG | Qualification in Career Guidance | In English | |
| QCM | Quartz Crystal Microbalance | In English | → Electronics |
| QCOP | QC Operating Procedure | In English | |
| QCS | Qualified Calibration Source | In English | |
| QD | Quick Disconnect | In English | |
| QD | Quantum Dot | In English | |
| QDOS | Quick and Dirty Operating System | In English | → Operating systems |
| QDR | Qualification Design Review | In English | |
| QDS | Quality Data System | In English | → Quality management |
| QE | Quality Engineering | In English | → Quality management |
| QE | Quadrant Elevation | In English | |
| QE | Quality Engineer | In English | → Quality management |
| Qe2 | Quantock Energy & Environment | In English | → Energy economics |
| QEC | Quick Engine Change | In English | |
| QED | Quantum Electrodynamics = EQD | Electrodinàmica Quàntica | In Catalan |
In English | → Physics |
| QEL | Queue Element | In English | |
| QES | Qwam E-content Server | In English | → Networks, communication → Libraries |
| QFD | Quality Functional Deployment | In English | → Quality management |
| QFD | Quality Function Deployment | In English | → Quality management |
| QFP | Quad Flat Pack | In English | → Electronics |
| QFT | Quantum Field Theory | In English | → Agricultural sciences |
| QFT | Queens Film Theatre | In English | → Cinema, movies → Theatre |
| QGS | Quantity Gauging System | In English | |
| QI | Quality Information | In English | → Quality management |
| QIC | Quality Information Control | In English | → Quality management |
|