IRT

IRT may refer to:

Organisations

 * Indiana Repertory Theatre, an American company of actors
 * Institut für Rundfunktechnik, a German research institute for broadcasters
 * Interborough Rapid Transit Company, a defunct New York subway operator

Science and technology

 * Imagery Rehearsal Therapy, see
 * Immunoreactive trypsinogen, newborn screening test for cystic fibrosis
 * Infrared thermography
 * Infrared Telescope, on the STS-51-F Space Shuttle mission
 * Item response theory, to interpret psychometric tests

Television

 * Ice Road Truckers, a reality television series
 * International Response Team, a fictional body in Criminal Minds

Other uses

 * IR Tanger, a Moroccan association football club
 * Incident response team, a group of people who respond to an emergency
 * International Registry of Tartans, a Scottish Tartans Authority textile database