| Abbreviation | Definition |
|---|---|
| PFCU | Proctor Federal Credit Union |
| PFCU | Purdue Federal Credit Union |
| PFIT | Perceptions of Fair Interpersonal Treatment |
| PFUJ | Pakistan Federal Union of Journalists |
| PGEU | Pharmaceutical Group of the European Union |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |
| PIN | Postal Index Number |
| PIPSC | Professional Institute of the Public Service of Canada |
| PISU | Pomeranian International Sex Union |
| PIU | Public International Unions |
| PKIU | Printing and Kindred Industries Union |
| PLU | Prefer Lesbians Union |
| PMCU | Pacific Marine Credit Union |
| PMCU | Pacific Marine Credit Union's |
| PMCU | Power Makers Credit Union |
| PMMU | Patriotic Myanmar Monks Union |
| PMU | Purdue Memorial Union |
| PMUA | Pie Makers Union of America |
| PNEU | Parents National Education Union |
| PNU | Polish National Union |