PTC
- PTC Inc.
- PTC India
- PTC Punjabi
- PTC Punjabi (Canada)
- PTC Punjabi Film Awards
- PTC Therapeutics
- PTC thermistor
- Pacific Telecommunications Council
- Pacific Theological College
- Paid to click
- Pakistan Telecommunication Company Ltd
- Pakistan Tobacco Company
- Pakuwon Mall
- Papillary thyroid cancer
- Parent-teacher conference
- Parents Television Council
- Partido Trabalhista Cristão
- Partit del Treball de Catalunya
- Pass-Through Certificates
- Patched
- Patrol torpedo boat PT-41
- Pennsylvania Turnpike Commission
- Peptidyl transferase centre
- Percutaneous transhepatic cholangiography
- Phase-transfer catalyst
- Phenylthiocarbamide
- Philadelphia Toboggan Coasters
- Philadelphia Transportation Company
- Piece to camera
- Pilot Training College
- Pioneer Theatre Company
- Pitcairn Islands
- Pittsburgh Technical College
- Players Tour Championship
- Police Training Centre
- Polska Telefonia Cyfrowa
- Poly(trimethylene carbonate)
- Polymeric positive temperature coefficient
- Portage Trail Conference
- Positive temperature coefficient
- Positive train control
- Potential tropical cyclone
- Premium Tax Credit
- Presbyterian Theological College
- Production tax credit
- Pseudotumor cerebri
- Public Services, Tax and Commerce Union
- Public Transport Commission
- Public Transport Corporation
- Public Transport Council
- Punggol MRT/LRT station
- RAF Personnel and Training Command
- Radio Television of Serbia
- Spacecraft thermal control