PTU
- Australian Rail Tram and Bus Industry Union
- Hong Kong Professional Teachers' Union
- PTU (film)
- Paratroop Training Unit RAAF
- Paroxysmal tonic upgaze
- Phenylthiourea
- Platinum Airport
- Plumbing Trades Union
- Podatek od towarów i usług
- Police Tactical Unit
- Police tactical unit (disambiguation)
- Power transfer unit
- Professional technical school
- Propylthiouracil
- Puducherry Technological University
- Punjab Technical University
- Pyay Technological University