| Acronym | Definition |
|---|
| CTU | Colorado Technical University |
| CTU | Counter Terrorist Unit |
| CTU | Clinical Trials Unit |
| CTU | Czech Technical University in Prague |
| CTU | Catholic Theological Union |
| CTU | Consulente Tecnico d'Ufficio (Italian judicial technical consultant) |
| CTU | Council of Trade Unions (New Zealand) |
| CTU | Chicago Teachers Union |
| CTU | Caribbean Telecommunications Union |
| CTU | Counter Threat Unit |
| CTU | Centre Thérapeutique Useldange (French: Useldange Therapeutic Center; Useldange, Luxembourg) |
| CTU | Colorado Trout Unlimited |
| CTU | Control Unit |
| CTU | Chengdu, China (Airport Code) |
| CTU | Cargo Transport Unit (shipping) |
| CTU | Confederation of Trade Unions |
| CTU | Cholera Treatment Unit (various locations) |
| CTU | Counter Top Unit |
| CTU | Computed Tomography Urogram (radiological procedure) |
| CTU | Commander, Task Unit |
| CTU | Counter Truancy Unit (Simpsons) |
| CTU | Coiled Tubing Unit |
| CTU | Centrale de Technologie Universitaire (French: Central University of Technology) |
| CTU | Construction Time Use (Kone) |
| CTU | Controlled Temperature Unit |
| CTU | Central Terminal Unit |
| CTU | Computer Training Unit |
| CTU | Centre Théologique Universitaire (French: University Theological Center) |
| CTU | Cabin Telecommunications Unit |
| CTU | Computer Training Unlimited |
| CTU | Chemistry/Toxicology Unit |
| CTU | Conductor Tensioner Unit (oil industry) |
| CTU | Comp Time Used |
| CTU | Channel Test Unit |
| CTU | Consolidated TOE Update |
| CTU | Center for Teknologistøttet Undervisning (Danish National Centre for Technology Supported Learning) |
| CTU | Centigrade Thermal Unit |
| CTU | Central Timing Unit |
| CTU | Cartridge Tape Unit |
| CTU | Cancer Treatment Unit |
| CTU | Command & Telemetry Unit |
| CTU | Charging Time Unit |
| CTU | Captive Test Unit |
| CTU | Central Office Terminal Unit |
| CTU | Conference on Transportation Unity |
| CTU | Customer Termination Unit |