| Acronym | Definition |
|---|
| TSIS➣Technical Support Information Services |
| TSIS➣TIES (Technology Information Education Services) Student Information System |
| TSIS➣Total Solar Irradiance Sensor (US NASA) |
| TSIS➣Training and Simulation Industry Symposium |
| TSIS➣Transportable Satellite Internet System |
| TSIS➣Transportation Security Intelligence Service |
| TSIS➣The Sky I Scrape (Pearl Jam song) |
| TSIS➣Tien Shan International School (Almaty, Kazakhstan American education style school) |
| TSIS➣Timber Sale Information System (Bureau of Land Management, USDI) |
| TSIS➣Talent Scout International School (Vienna, Austria) |
| TSIS➣Technical Services Information System |