THI

THI may refer to:

Businesses and organisations

 * Technische Hochschule Ingolstadt, a German university
 * Texas Heart Institute, an American medical non-profit
 * Tim Hortons Inc., a Canadian eatery chain

Other uses

 * Temperature-Humidity Index, in meteorology
 * Thirsk railway station, England (by station code)
 * Toomas Hendrik Ilves (born 1953), Estonian politician
 * Traffic Homicide Investigator, in US law enforcement
 * Tissue harmonic imaging, an ultrasonography technique