HRT may refer to:
Health and medicine
- Habit reversal training
- Heart rate turbulence
- Hormone replacement therapy
- Humane Research Trust, a British medical research charity
- Heidelberg Retinal Tomography, a diagnostic procedure that produces three-dimensional images of the optic nerve
Motor racing
- HRT Formula 1 Team, now defunct
- Walkinshaw Andretti United, an Australian motor racing team that previously traded as the Holden Racing Team
Transport
- Hampton Roads Transit, in the Norfolk-Virginia Beach, United States metro area
- Hartwell Railroad, in Georgia, United States
- Heavy rail transit
- Helsinki Regional Transport Authority (Swedish: Helsingfors Regionaltrafik)
- Hertfordshire Rail Tours, a defunct British railway company
- Hiroshima Rapid Transit, in Japan
- Honolulu Rail Transit, an under-construction light rail project in Hawaii
- 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
- Hrvatska radiotelevizija, Croatia's national broadcaster
- Hard real-time, in computing
- Hértevin language, spoken in Turkey
- High rising terminal, a feature of speech
- Hostage Rescue Team, the FBI's elite tactical unit
- Hudson River Trading, an American trading firm
- Hydraulic retention time, in hydrology