TIS may refer to:
- Taporoporo'anga Ipukarea Society, environmental NGO in the Cook Islands
- Tautanga Intermediate School, state intermediate school in Tauranga, New Zealand
- Technical Information System
- Telecom Italia Sparkle, global telecommunication service provider which is a wholly owned subsidiary of Telecom Italia
- Thermal Imaging System, device that captures an image using infrared radiation
- Tin Shui Wai Station, Hong Kong; MTR station code TIS
- Total Isotropic Sensitivity, a measurement of the three dimensional sensitivity of a wireless device
- Transparency International Slovakia, an anti-corruption non-governmental organization
- Travelers' Information Stations, low-power AM radio stations set up by local transport departments to provide bulletins to motorists
- Trusted Information Systems, computer security research and development company during the 1980s and 1990s
- Truth in Science, United Kingdom-based organization which has tried to get intelligent design taught alongside evolution in school science lessons
- Truth in sentencing, collection of policy stances on sentencing in the justice system that aim to abolish or curb parole for those convicted of crimes
Tis may refer to:
- a non-small cell lung carcinoma staging code for a carcinoma in situ
- ’Tis, a 1999 memoir by Frank McCourt which followed Angela's Ashes
- an ancient Persian town on the Gulf of Oman which was destroyed by the Mongols. See Chah Bahar.