| Acronym | Definition |
|---|
| TIS | Time In Service |
| TIS | Telefonski Imenik Slovenije (Slovenian: Telephone Directory of Slovenia) |
| TIS | Twenty Inches Strong (automotive wheel manufacturer) |
| TIS | Tokyo Illustrators Society (Tokyo, Japan) |
| TIS | Technical Information System |
| TIS | Technology in Schools (various locations) |
| TIS | The Inside Story |
| TIS | Translating and Interpreting Service (various locations) |
| TIS | The Information Society (various locations) |
| TIS | The Internet Society |
| TIS | Telephone Interpreting Service (various locations) |
| TIS | Telecom Italia Sparkle (Italian telecommunications company) |
| TIS | Trendmicro Internet Security |
| TIS | Telephone Interconnection System |
| TIS | Thread Independent Services |
| TIS | Trusted Information System |
| TIS | Trusted Information Systems |
| TIS | Translation and Interpretation Services (various locations) |
| TIS | Tsukuba International School (Ibaraki, Japan) |
| TIS | Traffic Information Service |
| TIS | Technical Information Section (various organizations) |
| TIS | Traffic Impact Study |
| TIS | Total Integrated Solutions (various locations) |
| TIS | Terminological Information System |
| TIS | Travel Industry Services (various locations) |
| TIS | Technical Information Services |
| TIS | Tool Induced Shift (semiconductors) |
| TIS | Thai Industrial Standard |
| TIS | Thermal Imaging System |
| TIS | Total Intelligence Solutions (various locations) |
| TIS | Thoracic Insufficiency Syndrome |
| TIS | Tohoku International School (Tokyo, Japan) |
| TIS | Tasmanian Institute of Sport (Australia) |
| TIS | This Is Sparta |
| TIS | Teaching International Students (Higher Education Academy) |
| TIS | Truth in Savings Act of 1991 |
| TIS | Technical Information Sheet |
| TIS | Technology and Information Services |
| TIS | Total Isotropic Sensitivity |
| TIS | Teacher Induction Scheme (UK) |
| TIS | Teacher in Space (NASA) |
| TIS | Telemedicine Information Service (UK) |
| TIS | Transport-Informations-Service (Germany) |
| TIS | Theater Intelligence Section (US Navy) |
| TIS | Trade Information Scheme (Commission for the Conservation of Southern Bluefin Tuna) |
| TIS | Tactical Input Segment |
| TIS | Tourist Information System |
| TIS | Trade Information System |
| TIS | Time Information System |
| TIS | Technology Information Service |
| TIS | Total Integrated Scatter |
| TIS | Technology Infrastructure Solutions, Inc. (Boca Raton, FL) |
| TIS | Technical Interface Specification |
| TIS | Travelers Information Service (radio broadcasting) |
| TIS | Turnkey Information Solutions (Jordan) |
| TIS | Transportable Isolation System (US Air Force) |
| TIS | Thursday Island, Queensland, Australia - Horn Island (Airport Code) |
| TIS | Total Information System |
| TIS | Target Ion Source |
| TIS | Tube Inspection Station (manufacturing) |
| TIS | Tactical Intelligence Squadron |
| TIS | Test Information Sheet |
| TIS | Technology Investment Strategy |
| TIS | Tolerance Index System (EPA) |
| TIS | Trials Instrumentation System |
| TIS | Tullinformationssystemet (Swedish: Customs Information System) |
| TIS | Tracking Instrumentation Subsystem |
| TIS | Ticket Issuing System |
| TIS | Training Integration System |
| TIS | Technomic Information Services |
| TIS | Target Information System |
| TIS | Terrain Information System |
| TIS | Total Impervious Surface |
| TIS | TAC Information System |
| TIS | Terminal Indicate Secondary |
| TIS | Transport and Infrastructure Services (Australia) |
| TIS | Target Image Simulator |
| TIS | Terminal Interface System |
| TIS | Trans-Impedance Stage |
| TIS | Tentative Interference Subtraction |
| TIS | Target Investing Consulting |
| TIS | Tube Ion Source |
| TIS | Tennessee Insurance Service Inc. |
| TIS | Textile Information System (Pty) Ltd |
| TIS | Travel Integrated System |
| TIS | Test Item Simulator |
| TIS | Timer Interrupt Switch |
| TIS | Test Instruction Sheet |
| TIS | Tauranga Intermediate School (New Zealand) |
| TIS | Transfer in Storage (textile industry) |