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 The Interborough Rapid Transit Company (IRT) was the private operator of New York City's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. The IRT ...

, 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 In psychometrics, item response theory (IRT, also known as latent trait theory, strong true score theory, or modern mental test theory) is a paradigm for the design, analysis, and scoring of Test (student assessment), tests, questionnaires, and sim ...

, 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 {{disambig