| Abbreviation | Definition |
|---|---|
| PPsS | Panellenios Psychologikos Syllogos |
| PPsS | Panhellenic Psychological Association |
| PPTS | Palestine Pilgrims' Text Society |
| PRCPP | PEW Research Centre for People and Press |
| PRCS | Palestine Red Crescent Society |
| PRDS | Participatory Rural Development Society |
| PRIS | Peace Region Internet Society |
| PROBIO | Association des Professeurs de Biologie |
| PROBIO | Association of Biology Teachers (Belgium) |
| ProGIS | Finnish Association for Geographic Information |
| ProGIS | ProGIS ry |
| PROGRESYS | PROGRESYS stands for "Progressive Strategies for Systemic Advancement and Sustainability," |
| PROS | Philadelphia Regional Ophthalmic Society |
| PRPS | Pennsylvania Recreation and Park Society |
| PRS | Performing Right Society |
| PRSA | Proportional Representation Society of Australia |
| PRSA | Public Relations Society of America |
| PRSB | Proceedings of the Royal Society B |
| PRSE | Presidents of the Royal Society of Edinburgh |
| PRSI | Public Relation Society of India |