TDI
# TDI

TDI may refer to:

## Science and technology

* Tolerable daily intake, in toxicology
* Toluene diisocyanate, an organic chemical
* Time delay and integration, timing synchronization in an image sensor
* Tissue Doppler imaging, a medical ultrasound technology
* Tabbed document interface, a type of graphical user interface
* Total dual integrality, a property of matrices in mathematical optimization
* Transport Driver Interface, used by NT series Windows to abstract level 7 APIs into a common protocol for the Transport Protocol layer
* Telecom data intelligence, ability to extract detailed customer profiling data
* Trophic Diatom Index, water quality and ecological status; see Sattal
* Turbocharged Direct Injection, a diesel engine design used in cars and light vans made by Volkswagen Group

## Organizations

* Technical Diving International, a technical diving organization
* Telecommunications for the Deaf, Inc., a nonprofit organization promoting telecommunications devices for the deaf
* Texas Department of Insurance
* The Dartmouth Institute for Health Policy and Clinical Practice, a subsidiary of Dartmouth College
* Transportation Displays, Inc., a unit of Outfront Media

## Entertainment

* Total Drama Island, an animated reality series
   * Total Drama Island, the 2023 reboot with the same name.
* Tangerine Dream Independent, the record label belonging to Edgar Froese
