- AdTI stands for Alexis de Tocqueville Institute
- ADTI stands for Acid Drainage Technology Initiative (est. 1995; West Virginia University)
- ADTI stands for Advance Display Technologies, Inc.
- ADTI stands for American Data Technology, Inc. (Research Triangle Park, NC)
- ADTI stands for Assisted Dying for the Terminally Ill (bill)
- ADTI stands for Akademia Doskonalenia Technik Informatycznych (Polish: Computer Science Training Academy; EU)
ADTI