| Acronym | Definition |
|---|
| TTU | Texas Tech University (Lubbock, TX, USA) |
| TTU | Tennessee Technological University |
| TTU | Timor Tengah Utara (Indonesian: North Central Timor) |
| TTU | Talk To You |
| TTU | Teachers Trade Union |
| TTU | Two Thumbs Up |
| TTU | Tennessee Temple University (Chattanooga, TN) |
| TTU | Tallinn Technical University (Estonia) |
| TTU | Talk To Us (theater troupe) |
| TTU | Timing Terminal Unit (US NASA) |
| TTU | Transportable Treatment Unit |
| TTU | Traditional Taekwondo Union (Norway; est. 1996) |
| TTU | Ten Toes Up (band) |
| TTU | Transportation Terminal Unit |
| TTU | Thermal Treatment Unit(s) |
| TTU | Through Transmission Ultrasonic |
| TTU | Toyo Tanso USA, Inc. (Troutdale, OR; est. 1941) |
| TTU | The Tempest Union (gaming clan) |
| TTU | Terminal Transportation Unit |
| TTU | Time Tag Unit |