STI may refer to:

In science and technology

Biology and psychology

Sexually transmitted infection A sexually transmitted infection (STI), also referred to as a sexually transmitted disease (STD) and the older term venereal disease (VD), is an infection that is Transmission (medicine), spread by Human sexual activity, sexual activity, e ...

* Signal transduction inhibitor, a drug type * Soft tissue injury *

Symptom targeted intervention Symptom targeted intervention (STI) is a clinical program being used in medical settings to help patients who struggle with symptoms of Depression (mood), depression or anxiety or Compliance (medicine), adherence to treatment plans but who are not i ...

, for treating depression

Electronics and computing

* Shallow trench isolation, prevents current leakage inside chips * STI (x86 instruction), enables interrupts * Still Image Architecture in MS Windows

Other uses in science and technology

* Shimano Total Integration, for bicycle gears * Speech transmission index, a measure of speech intelligibility * Stationary target indication, a radar mode * Subaru Impreza WRX STI, car models * Verkehrsbetriebe STI, a bus operator, Bern, Switzerland

Businesses and organizations

Educational organizations

* Sail Training International, British non-profit, trains people on sailing ships * STI College, Philippine IT network