| TTO | Trinidad and Tobago (ISO Country code) | 特立尼达和多巴哥（ISO国家代码） |
| TTO | Tactical Technology Office (DARPA) | 战术技术办公室（DARPA） |
| TTO | Three True Outcomes (baseball) | 三个真正的结果（棒球） |
| TTO | Transient Tracers in the Oceans | 海洋中的瞬变示踪剂 |
| TTO | Transmission Top-Off (automotive assembly) | 变速器顶部关闭（汽车总成） |
| TTO | Tortoise Capital Resources Corporation (stock symbol) | 乌龟资本资源公司（股票代码） |
| TTO | Britton, South Dakota USA | 美国南达科他州布里顿 |
| TTO | Tanker Take Over | 油轮接收 |
| TTO | Triple Tibial Osteotomy (veterinary medicine) | 三胫骨截骨术（兽医） |
| TTO | Transfer To Oas | 转到Oas |
| TTO | Transient Tracers in the Ocean | 海洋中的瞬变示踪剂 |
| TTO | Triple Triad Online | 三合会在线 |
| TTO | Total Toxic Organics | 有毒有机物总量 |
| TTO | Technical Training Officer | 技术培训官 |
| TTO | Technology Transfer Office | 技术转让办公室 |
| TTO | Thermal Transfer Overlay (printers) | 热转印覆盖（打印机） |
| TTO | Test Time Objective (disaster recovery) | 测试时间目标（灾难恢复） |
| TTO | Transition to Operations | 过渡到运营 |
| TTO | To Take Out (prescriptions in hospital discharge summary) | 取出（出院总结中的处方） |
| TTO | Technology Transition Office (US DoD) | 技术过渡办公室（美国国防部） |
| TTO | Time Trade-Off | 时间权衡 |
| TTO | Talk To (command in the LOGO programming language) | Talk To（LOGO编程语言中的命令） |
| TTO | ToonTown Online (game) | ToonTown Online（游戏） |
| TTO | Transnational Terrorist Organization | 跨国恐怖组织 |
| TTO | Tool Try Out | 工具试用 |
| TTO | Trailing Throttle Oversteer | 拖车油门转向过度 |
| TTO | Tactile Technology Office | 触觉技术办公室 |
| TTO | Transtracheal Oxygen | 经气管氧气 |
| TTO | Tea Tree Oil | 茶树油 |
| TTO | Tourism Training Organisation | 旅游培训组织 |
| TTO | Technical Task Order | 技术任务单 |