| Abbreviations | Meaning |
 | PMAC | Pharmaceutical Manufacturers Association Of Canada; Phenylmercuric Acetate; Programmable Multi-axis Controller |
| PMHAB | Provincial Mental Health Advisory Board [Canada] |
| PNHA | Physicians National Housestaff Association |
| POS | Piedmont Orthopaedic Society |
| POSI | Paediatric Orthopaedic Society Of India |
| POSNA | Pediatric Orthopaedic Society Of North America (AAOS Specialty Societies) |
| PPS | Physician, Patient And Society |
| PPS | Physician, Patient And Society [course] |
| PRB | Basic Proline-rich Protein; Prosthetics Research Board |
| PRRB | Provider Reimbursement Review Board |
| PSI | Psychiatric Society For Informatics |
| PWD | Posterior Wall In Diastole; Printed Wiring Board |
| RACGP | Royal Australian College Of General Practitioners |
| RACS | Royal Australasian College Of Surgeons |
| RB | Rating Board |
| RBNA | Royal British Nurses Association |
| RCGP | Royal College Of General Practitioners |
| RCM | Royal College Of Midwives |
| RCN | Right Caudate Nucleus; Royal College Of Nursing |
| RCOG | Royal College Of Obstetricians And Gynaecologists |
| RCP | Royal College Of Physicians |
| RCP | Radiochemical Purity; Red Cell Protoporphyrin; Retrocorneal Pigmentation; Riboflavin Carrier Protein; Royal College Of Physicians |
| RCPATH | Royal College Of Pathologists |
| RCPSC | Royal College Of Physicians And Surgeons Of Canada |
| RCPSGLAS | Royal College Of Physicians And Surgeons, Glasgow |
| RCS | Royal College Of Science |
| RCS | Royal College Of Surgeons |
| RCSE | Royal College Of Surgeons, Edinburgh |
| RCSED | Royal College Of Surgeons Of Edinburgh |
| RCSENG | Royal College Of Surgeons Of England |
| RCSI | Royal College Of Surgeons In Ireland |
| RCVS | Royal College Of Veterinary Surgeons |
| RESNA | Rehabilitation Engineering And Assistive Technology Society Of North American |
| RESNA | Rehabilitation Engineering Society Of North America |
| RHB | Regional Hospital Board [UK]; Right Heart Bypass |
| RHBS | Regional Hospital Boards |
| RHCSA | Regional Hospitals Consultants' And Specialists' Association |
| RJOS | Ruth Jackson Orthopaedic Society (also: AAOS Specialty Societies) |
| RMPA | Royal Medico-Psychological Association |
| RSH | Royal Society Of Health |
| RSM | Royal Society Of Medicine |
| RSM | Risk Screening Model; Royal Society Of Medicine |
| RSNA | Radiological Society Of North America |
| RSNA | Radiological Society Of North America; Renal Sympathetic Nerve Activity |
| RSPCA | Royal Society For The Prevention Of Cruelty To Animals |
| RSPH | Royal Society For The Promotion Of Health |
| RSTMH | Royal Society Of Tropical Medicine And Hygiene |
| SAB | Society Of American Bacteriologists |
| SAB | Scientific Advisory Board |
| SACNAS | Society For The Advancement Of Chicanos And Native Americans In Science |
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