| TSI | Turbine Supervisory Instrumentation | 汽轮机监测仪表 |
| TSI | Timeslot Interxhange | 时隙交换 |
| TSI | Transportation Safety Institute (US DOT) | 运输安全协会（US DOT） |
| TSI | Trading Standards Institute (UK) | 贸易标准协会（英国） |
| TSI | Transportation Safety Institute | 运输安全协会 |
| TSI | Training Standards Institute | 培训标准协会 |
| TSI | Treehouse Software Inc. | Treehouse软件公司。 |
| TSI | Transmitting Subscriber Identification | 发送用户标识 |
| TSI | Traumatic Stress Institute | 创伤应激研究所 |
| TSI | Thyroid Stimulating Immunoglobulin | 甲状腺刺激免疫球蛋白 |
| TSI | TRADOC Simulation Internet | 训练与条令司令部仿真互联网 |
| TSI | Total Sum Insured | 总保险金额 |
| TSI | Threshold Signal-to-Interference Ratio | 阈值信号干扰比 |
| TSI | Turksportal Interactive | Turksportal互动 |
| TSI | Talent Scouts Inc. | 人才童子军公司。 |
| TSI | Temporal Sharing Interface | 临时共享界面 |
| TSI | Thermal System Insulation (industry & regulatory term used with regard to asbestos) | 热系统绝缘(工业和管理术语以石棉) |
| TSI | Thermal Systems Inc (Scarborough, Maine) | 热力系统公司（缅因州斯卡伯勒） |
| TSI | Trophic Status Index (water quality) | 营养状态指数（水质） |
| TSI | Twin Stage Impinger | 双级冲击器 |
| TSI | Turbo Stratified Injection | 涡轮分层喷射 |
| TSI | Transportation Systems Institute | 交通系统研究所 |
| TSI | Teachers Summer Institute | 教师暑期学院 |
| TSI | Time Slot Interchange | 时隙交换 |
| TSI | Turn Signal Intakes | 转向信号入口 |
| TSI | Tsimshian | 茨姆锡安人 |
| TSI | Tsili Tsili, Papua New Guinea | 巴布亚新几内亚Tsili Tsili |
| TSI | Turbo Sport Intercooled | Turbo Sport中冷 |
| TSI | The Silent Interrogators | 沉默的审问者 |
| TSI | Tom Sawyer Island | 险岛 |
| TSI | Two Speed Idle | 双速怠速 |
| TSI | Telecommunication Security Information | 电信安全信息 |
| TSI | Third Season Inconsistency | 第三季不一致 |
| TSI | Total Solar Irradiance | 太阳总辐照度 |
| TSI | Training Systems Integration (US Army) | 训练系统集成（美国陆军） |
| TSI | Training Support Infrastructure (US Army TRADOC/ATSC/ATMD) | 培训支持基础设施(美国军队TRADOC / ATSC / ATMD) |
| TSI | Timber Stand Improvement (forestry) | 林分改良（林业） |
| TSI | Thinking Style Inventory | 思维方式清单 |
| TSI | Technical Sales International, LLC (Austin, TX ) | 技术销售国际有限责任公司（德克萨斯州奥斯汀） |
| TSI | Turbo Sport Injection (automotive) | Turbo Sport Injection（汽车） |
| TSI | Technical Service Information | 技术服务信息 |
| TSI | Test Ship Integration | 测试船集成 |
| TSI | Tactical Situation Indicator | 战术态势指示器 |
| TSI | Time-Space Illusion | 时空错觉 |
| TSI | initial mean skin temperature | 初始平均皮肤温度 |
| TSI | Total Systems Integration, Inc (Galion, Ohio) | Total Systems Integration，Inc（俄亥俄州加利昂） |
| TSI | triple sugar(lactose,glucose,sucrose)iron | 三糖（乳糖、葡萄糖、蔗糖）铁 |
| TSI | Triple Sugar Iron | 三糖铁 |
| TSI | thyroid-stimulating immunoglobulins | 促甲状腺免疫球蛋白 |
| TSI | Technical Specifications for Interoperability (railway standards) | 互操作性技术规范（铁路标准） |
| TSI | Transmitting Station Information (Fax) | 发送站信息（传真） |
| TSI | Transportation System Improvement | 运输系统改进 |
| TSI | Touring Sport Injection | Touring Sport喷油器 |
| TSI | That's Scrap Inc (Apple Valley, MN) | 苹果公司的山谷、废(MN) |
| TSI | The Skeptical Inquirer | 怀疑论者 |
| TSI | Transportation Security Incident | 交通安全事件 |
| TSI | Top Systems Inc. | Top Systems公司。 |
| TSI | Transport Subsystem Interface | 传输子系统接口 |
| TSI | Technical Standardization Inspection | 技术标准化检查 |
| TSI | Tech Services International | 技术服务国际 |
| TSI | TEMPEST Security Index | TEMPEST安全索引 |
| TSI | Time Slot Interchange/r | 时间交换/ r |
| TSI | Teach Services Inc. (book publisher) | Teach Services Inc.（图书出版商） |
| TSI | True Sales Initiative | 真正的销售计划 |
| TSI | Territory Sales Incharge | 区域销售负责人 |
| TSI | Total Solar Irradiance (sum solar light in energy per unit of time) | 太阳总辐照度（单位时间的太阳光能量总和） |
| TSI | Terminal Support Interface | 终端支持界面 |
| TSI | Target Status Indicator | 目标状态指示器 |
| TSI | Technical Site Information | 技术现场信息 |
| TSI | Typography Systems International | 国际印刷系统 |
| TSI | Telecommunications Service Inquiry (Australia) | 电信服务查询（澳大利亚） |
| TSI | Terminal Signaling Interface | 终端信号接口 |