| PTTI | Penetrating Thoracic Trauma Index 
| Others |
| PTTI | Penggalang Taksonomi Tumbuhan Indonesia
| Others |
| PTTI | Pennsylvania Transformer Technology Inc
| Others |
| PTTI | Philadelphia Technical Training Institute
| Others |
| PTTI | Philadelphia Technician Training Institute
| Others |
| PTTI | Play Therapy Training Institute
| Others |
| PTTI | Postal, Telegraph and Telephone International
| Others |
| PTTI | Posterior Tibial Tendon Insufficiency
| Others |
| PTTI | Precise Time and Time Interval
| Others |
| PTTI | Precise Time and Time Interval Pub Publication
| Others |
| PTTI | Precise Time and Timing Interval
| Others |
| PTTI | Precise Time Time Interval
| Others |
| PTTI | Precision Time And Time Interval
| Others |
| PTTI | Primary Teacher Training Institutes
| Others |
| PTTI | Provisional Total Tolerable Intake
| Others |
| PTTI | Push To Talk International
| Others |