| Acronym | Definition |
|---|
| PTA | Parent-Teacher Association |
| PTA | Please Try Again |
| PTA | Physical Therapist Assistant |
| PTA | Percutaneous Transluminal Angioplasty |
| PTA | Pakistan Telecommunication Authority |
| PTA | Paul Thomas Anderson (director) |
| PTA | Prevention of Terrorism Act (UK) |
| PTA | Purified Terephthalic Acid |
| PTA | Passenger Transport Authority |
| PTA | Post Traumatic Amnesia |
| PTA | Preferential Trade Agreement |
| PTA | Prepaid Ticket Advice |
| PTA | Pharmazeutisch-Technische Assistentin (German Profession in Medical Sector) |
| PTA | Primetime Adventures |
| PTA | Plasma Thromboplastin Antecedent (blood coagulation factor XI) |
| PTA | Pure Tone Average (hearing exams) |
| PTA | Pohakuloa Training Area (US Army; Hawaii) |
| PTA | Prior To Arrival |
| PTA | Pietà (postal locality, Malta) |
| PTA | Prior To Admission |
| PTA | Predicted Transmitting Ability |
| PTA | Parent and Teacher Association |
| PTA | Planes, Trains, and Automobiles |
| PTA | Pilotless Target Aircraft |
| PTA | Peritonsillar Abscess |
| PTA | Patent Term Adjustment |
| PTA | Spanish Peseta (national currency) |
| PTA | Physiotherapy Assistant |
| PTA | Provincial Training Allowance |
| PTA | Picatinny Arsenal |
| PTA | Packed Tower Aeration |
| PTA | Promise to Appear (in court) |
| PTA | Pressure Transient Analysis |
| PTA | Power Tool Accessories |
| PTA | Point of Total Assumption |
| PTA | Pennsylvania Telephone Association |
| PTA | Points-To Analysis |
| PTA | Public Transport Association |
| PTA | Postcard Traders Association (UK) |
| PTA | Pulsar Timing Array |
| PTA | PPP Termination and Aggregation |
| PTA | Pianoforte Tuners' Association (UK) |
| PTA | Primary Training Audience |
| PTA | Post and Telekom Austria |
| PTA | Petrograd Telegraph Agency (ROSTA predecessor 1914-1918) |
| PTA | Principal Technical Advisor |
| PTA | Pre-Trial Agreement |
| PTA | Personal Test Automation (SONET) |
| PTA | Personal Trust Assistant |
| PTA | Paducah Transit Authority (Kentucky, USA) |
| PTA | Partition Top Anchors (construction) |
| PTA | Play to Air (broadcasting) |
| PTA | Planarized-Trench Aluminum |
| PTA | Proposed Technical Approach(es) |
| PTA | Primary Target Area |
| PTA | Propellant Tank Assembly |
| PTA | Passive Tracking Algorithm |
| PTA | Paper Traders Association (India) |
| PTA | Pitch Trim Actuator |
| PTA | Planned Time of Arrival |
| PTA | Progeny Transmitting Ability (breeding) |
| PTA | Programmed Time of Arrival |
| PTA | Program Transfer Agreement |
| PTA | Predicted Target Area (US Navy) |
| PTA | Primary Training Activities |
| PTA | Parents and Taxpayers for Accountability |
| PTA | Provincial Telecommunication Authority (China) |
| PTA | Phase Transition Analyser |
| PTA | Precise Timing and Astrometry |
| PTA | Personal Threat Alarm |
| PTA | Platform Technical Advisor |
| PTA | Physical Terminal Address |
| PTA | Proficiency Training Aircraft |
| PTA | Product Test Authorization |
| PTA | Pope and Talbot Line (railroad) |
| PTA | Pre-Tendering Approval (ElectronicTender) |