| Abbreviation | Definition |
|---|---|
| PIA | Philadelphia International Airport |
| PIA | Public and International Affairs |
| PIANC | The World Association for Waterborne Transport Infrastructure |
| PIARC | Permanent International Association of Road Congresses |
| PIBMM | Permanent International Bureau of Motorcycle Manufacturers |
| PIC | Preferred Interstate Carrier |
| PICT | Pakistan International Container Terminal |
| PID | Policy Initiatives and Communication |
| PIDP | Programmable Indicator Data Processor |
| PIDS | Passenger Information Display System |
| PIE | Pan Island Expressway |
| PILH | Ponce Inlet LightHouse |
| PILL | Newport Dock - British depot code |
| PILS | Ponce de Leon Inlet Light Station |
| PILSTA | Pilot Station |
| PIM | Pressure In Manifold |
| PINS | Personal Interface For Navigational Systems |
| PIO | Pilot Induced Oscillations |
| PIP | Project Implementation Plan |
| PIREP | Pilot Report |