| Acronym | Meaning |
 | PTIS | Photothermal Ionization Spectroscopy |
| PTK | Protein Tyrosine Kinase |
| PTM | Perturbation Trajectory Method (in Gas-surface Collision Dynamics) |
| PTM | Posttranslational Modification |
| PTMG | Polytetramethylene Glycol |
| PTMT | Poly (tetramethylene Terephthalate) |
| PTNO | Perturbation Theory Natural Orbital |
| PTO | U.S. Patent And Trademark Office |
| PTP | Protein Tyrosine Phosphatase |
| PTR | Photothermal Radiometry |
| PTR | Proton Transfer Reaction |
| PTR-MS | Proton Transfer Reaction-mass Spectrometry |
| PTRI | Programmed Temperature Retention Index |
| PTS | Pressure Tuning Spectroscopy |
| PTS | Phosphotransferase System |
| PTS | Position-tagged Spectroscopy |
| PTS | Pressurized Thermal Shock |
| PTSA | Pressure And Temperature Swing Adsorption |
| PTSD | Post-traumatic Stress Disorder |
| PTSPGF | Perturbative-type Single-particle Green Function |
| PTV | Particle-tracking Velocimetry |
| PTV | Programmed Temp. Vaporizing |
| PTWI | Provisional Tolerable Weekly Intake |
| PTX | Pertussis Toxin |
| PUCHF | Perturbed Uncoupled Hartree-Fock |
| PUF | Polyurethane Foam |
| PUFA | Polyunsaturated Fatty Acid |
| PUHF | (spin)-projected Unrestricted Hartree-Fock |
| PUHFS | Projected Unrestricted-Hartree-Fock-Slater |
| PUMP | Projected Unrestricted Moeller-Plesset |
| PUMP | Pure (alpha-spin-state) Unrestricted Moeller-Plesset Nth-order (wave Function) |
| PURPA | Public Utility Regulatory Policy Act |
| PV-RR | Perturbational-variational-Rayleigh-Ritz (matrix Method In Mol. Calcns.) |
| PVA | Polyvinyl Alcohol |
| PVAC | Poly(vinyl Acetate) |
| PVAL | Polyvinyl Alcohol |
| PVB | Poly(vinyl Butyral) |
| PVB | Projected Valence Bond |
| PVB-CSF | Projected Valence Bond-configuration State Function |
| PVC | Pigment Volume Concentration |
| PVC | Polyvinyl Chloride |
| PVD | Physical Vapor Deposition |
| PVDC | Poly(vinylidene Dichloride) |
| PVDF | Polyvinylidene Difluoride |
| PVEC | Photovoltaic Energy Conversion |
| PVF | Poly(vinyl Fluoride) |
| PVFM | Poly(vinyl Formal) |
| PVM | Photovoltaic Power Module |
| PVMS | Pressure Vessel Management System |
| PVN | Paraventricular Nucleus |
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