| Acronym | Definition |
|---|
| STU | Student |
| STU | Secure Telephone Unit |
| STU | St. Thomas University (Fredericton, New Brunswick) |
| STU | St. Thomas University (Miami, Florida) |
| STU | Slovenskej Technickej Univerzity (Slovenia: Slovak University of Technology) |
| STU | Stuttgart Stock Exchange (Germany) |
| STU | Set Top Unit |
| STU | Streaming Tape Unit |
| STU | System Testing Unit |
| STU | Sturgeons (FAO fish species code) |
| STU | SHDSL (Single-Line High-Bit-Rate Digital Subscriber) Transceiver Unit |
| STU | Separate Technical Unit (manufacturing regulations) |
| STU | Short Term Update |
| STU | Subscriber Terminal Unit (data over cable) |
| STU | Slovak Technical University |
| STU | Società di Trasformazione Urbana (Italian: Urban Transformation Company) |
| STU | Star Tracker Unit |
| STU | Special Tactical Unit |
| STU | Security Technology Unit |
| STU | Steel Tube Umbilical (energy exploration) |
| STU | Stuart Petroleum Limited (Adelaide, Australia; stock symbol) |
| STU | Satellite Transmission Unit |
| STU | Special Teams Unit |
| STU | Secure Terminal Unit |
| STU | Short Ton Unit |
| STU | Singapore Teachers Union |
| STU | Shuttle Test Unit (US NASA) |
| STU | Sensor Transmitter Unit |
| STU | Secure Telecommunication Unit |
| STU | Systems Test Unit |
| STU | Sled Test Unit |
| STU | Science, Technology, and Utilization |
| STU | Skin Test Unit |
| STU | Stratum Traceability Unknown (Sprint) |
| STU | Société Internationale d'Urologie (French) |
| STU | Sync Traceability Unidentified |
| STU | Special Topics Update |
| STU | Shock Treatment Unit (medical) |
| STU | Signal Transmission Unit |