HRT

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
 * Heart rate turbulence
 * Humane Research Trust, a British medical research charity

Motor racing

 * HRT Formula 1 Team, a defunct racing team
 * 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, a term for types of passenger rail
 * Helsinki Regional Transport Authority (Swedish: Helsingfors Regionaltrafik)
 * Hertfordshire Rail Tours, a defunct British railway company
 * Hiroshima Rapid Transit, in Japan
 * Honolulu Rail Transit, now known as the Skyline, a light metro 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

 * Hard real-time, in computing
 * Hértevin language, spoken in Turkey
 * Hertfordshire, 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, in hydrology
 * Hostage Rescue Team, a tactical unit of the Federal Bureau of Investigation