| Abbreviation | Definition |
|---|---|
| PSNI | Pharmaceutical Society of Northern Ireland |
| PSOH | Pennsylvania Society of Oncology Hematology |
| PSRA | Pleasanton Soccer Referee Association |
| PSSA | Political Science Student Association |
| PTA | Public Transit Association |
| PTCA | Professional Training and Consulting Association |
| PTCB | Pharmacy Technicians Certification Board |
| PTG | Piano Technicians Guild |
| PTI | Power Tool Institute |
| PTML | Polskiego Towarzystwa Medycyny Lotniczej (Polish Society of Aviation Medicine) |
| PTSA | Parents Teachers And Students Association |
| PTSD | Pestilence Terminator Spells Destruction |
| PTTA | Piedmont Triad Transportation Association |
| PUJ | Punjab Union of Journalists |
| PUL | Press Union of Liberia |
| PWA | Patients Welfare Association |
| PWA | Polish Welfare Association |
| PWFL | Professional Women of the Finger Lakes |
| PWO | Professional Wastewater Operations |
| PYA | Professional Yachtsmen's Association |