| Term | Full Form | Category |
|---|---|---|
| PTPI | Pacific Tax Policy Institute | Others |
| PTPI | People To People International | Others |
| PTPI | Performance Through People International | Others |
| PTPI | Piedmont-Triad Paranormal Investigations | Others |
| PTPI | Polskie Towarzystwo Psychoterapii Integratywnej | Others |
| PTPI | Pre Tax Pre Interest | Others |
| PTPI | Professional and Technical Programs, Inc. | Others |
| PTPI | Project Talent Personality Inventory | Others |
| PTPI | Property Tax Performance Index | Others |