| Abbreviation | Definition |
|---|---|
| PBTF | Pediatric Brain Tumor Foundation |
| PBTFUS | Pediatric Brain Tumor Foundation of the United States |
| PBTFUS | Pediatric Brain Turmor Foundation of the United States |
| PBU | Polar Bears Unlimited |
| PBV | Prevent Blindness Virginia |
| PBW | Project Bird Watch |
| PC | PetSMart Charities |
| PC | Population Connection |
| PC | Population Council |
| PC | Presidential Classroom |
| PC | Programme Committee |
| PC | Public Citizen |
| PCAA | Prevent Child Abuse America |
| PCAM | Prevent Child Abuse Michigan |
| PCAN | Pediatric Cancer Action Network |
| PCAP | Partnerships for Compliance Assistance Program |
| PCC | Pennsylvania Conservation Corps |
| PCCC | Meyer L. Prentis Comprehensive Cancer Center |
| PCCCL | Philippine Cabin Crew Charities Hong Kong Limited |
| PCCF | Peninsula Conservation Center Foundation |