HRT most commonly refers to: * Hormone replacement therapy, a treatment used to reduce symptoms associated with menopause * Transgender hormone therapy, also known as hormone replacement therapy * Hostage Rescue Team, the FBI's elite tactical unit HRT may also refer to:

Health and medicine

Habit reversal training Habit reversal training (HRT) is a "multicomponent behavioral treatment package originally developed to address a wide variety of repetitive behavior disorders". Behavioral disorders treated with HRT include tics, trichotillomania, nail biting, th ...

Heart rate turbulence Heart rate turbulence (HRT) is the return to equilibrium of heart rate after a premature ventricular contraction (PVC). It consists of a brief speed-up in heart rate, followed by a slow decrease back to the baseline rate. An important feature of H ...

Humane Research Trust The Humane Research Trust (HRT) is a British medical research charitable organization, charity with the aim of spreading the practice of humane research. They work with scientists as well as students to further the commitment of non-animal testing, ...

, a British medical research charity * Heidelberg Retinal Tomography, a diagnostic procedure that produces three-dimensional images of the

optic nerve In neuroanatomy, the optic nerve, also known as the second cranial nerve, cranial nerve II, or simply CN II, is a paired cranial nerve that transmits visual system, visual information from the retina to the brain. In humans, the optic nerve i ...

Motor racing

* Haupt Racing Team, a German auto racing team *

HRT Formula 1 Team HRT Formula 1 Team, formerly known as Campos Meta 1 and Hispania Racing, was a Spanish Formula One team founded by former driver Adrián Campos. It was sold to José Ramón Carabante before its debut in 2010, and then to investment group Th ...

, now defunct * Walkinshaw Andretti United, an Australian motor racing team that previously traded as the Holden Racing Team

Transport

Hampton Roads Transit Hampton Roads Transit (HRT), incorporated on October 1, 1999, began through the voluntary merger of PENTRAN ( Peninsula Transportation District Commission) on the Virginia Peninsula and TRT ( Tidewater Regional Transit a.k.a. Tidewater Transit ...

, in the Norfolk-Virginia Beach, United States metro area *

Hartwell Railroad The Hartwell Railroad dates to 1878 when the company was chartered to build a narrow gauge rail line between Hartwell and Bowersville in Hart County, Georgia. The 10-mile railroad was completed the following year. In 1898, it was reorganized as ...

, in Georgia, United States *

Heavy rail transit Various terms are used for passenger railway lines and equipment; the usage of these terms differs substantially between areas: Rapid transit A rapid transit system is an electric railway characterized by high speed (~) and rapid accelerati ...

Helsinki Regional Transport Authority The Helsinki Regional Transport Authority ( fi, Helsingin seudun liikenne, HSL; sv, Helsingforsregionens trafik, HRT) is the inter-municipal authority that maintains the public transportation network of the nine municipalities of Greater H ...

(Swedish: ') * Hertfordshire Rail Tours, a defunct British railway company * Hiroshima Rapid Transit, in Japan * Honolulu Rail Transit, now known as

Skyline A skyline is the outline or shape viewed near the horizon. It can be created by a city’s overall structure, or by human intervention in a rural setting, or in nature that is formed where the sky meets buildings or the land. City skylines ...

, an under-construction light metro project in

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...

* Hurlburt Field, a United States Air Force field in Florida, United States * RAF Linton-on-Ouse, a Royal Air Force station in England (IATA code: HRT)

Other uses

* Hard real-time, in computing * Hértevin language, spoken in Turkey *

Hertfordshire Hertfordshire ( or ; often abbreviated Herts) is one of the home counties in southern England. It borders Bedfordshire and Cambridgeshire to the north, Essex to the east, Greater London to the south, and Buckinghamshire to the west. For govern ...

, county in England, Chapman code * High rising terminal, a feature of speech * Hrvatska radiotelevizija, Croatia's national broadcaster * Hudson River Trading, an American trading firm *

Hydraulic retention time The residence time of a fluid parcel is the total time that the parcel has spent inside a control volume (e.g.: a chemical reactor, a lake, a human body). The residence time of a set of parcels is quantified in terms of the frequency distribution ...

, in hydrology * Hostage Rescue Team, a tactical unit of the Federal Bureau of Investigation {{Disambiguation