| Acronym | Definition |
|---|
| APTU➣Antwerpse Provinciale Taxi Unie (Dutch: Antwerp Provincial Taxi Union; Antwerp, Belgium) |
| APTU➣Association of Public Transport Users (Harpenden, Hertfordshire, England, UK) |
| APTU➣Army Participating Test Unit |
| APTU➣African Postal and Telecommunications Union |
| APTU➣Army Prototype Test Unit |
| APTU➣Auxiliary Power and Thrust Unit |