| Abbreviation | Definition |
|---|---|
| PCLU | Pittsburgh Central Labor Union |
| PCLU | Polytechnic College of La Union |
| PCS | Public and Commercial Services Union |
| PCSU | Public and Commercial Services Union |
| PCU | Painesville Credit Union |
| PCU | Pawtucket Credit Union |
| PCU | Peninsula Credit Union |
| PCUS | Parti communiste de l'Union soviétique |
| PDU | Project for Democratic Union |
| PDYU | Palestinian Democratic Youth Union |
| PEEU | Private Enterprises Employees Union |
| PEEU | Provincial Electric Employees Union |
| PEF | Public Employees Federation |
| PENGASSAN | Petroleum and Natural Gas Senior Staff Association of Nigeria |
| PEU | Professional Educators Union |
| PEU | Public Employees Union |
| PFCU | Pacific Federal Credit Union |
| PFCU | Partners Federal Credit Union |
| PFCU | Peoples Federal Credit Union |
| PFCU | Platinum Federal Credit Union |