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 Trophic Diatom Index, water quality and ecological status; see Sattal TDI (engine) (turbocharged direct injection), a diesel engine design used in cars and light vans made by Volkswagen Group