HR

HR, Hr or hr may refer to:

Science, technology and engineering

HR (gene) (Hairless homolog (mouse)), a gene which encodes a protein whose function has been linked to hair growth
HR (software), a program that automatically forms mathematical theories by searching for sequences of numbers
Haemodynamic response, rapid delivery of blood to active neuronal tissues
Half Rate (HR or GSM-HR), a speech coding system for GSM developed in the early 1990s
Hazard ratio, the effect of an explanatory variable on the hazard or risk of an event
Heart rate (HR), a measure of the number of heart beats per minute (bpm)
Hertzsprung–Russell diagram (H-R diagram or HRD, also known as a colour-magnitude diagram or CMD), used in understanding stellar evolution in astronomy and astrophysics
High-Resolution High-Definition (HRHD, HR, HRHDTV or HR.HDTV), referring to an image resolution derived from high-definition video
Homologous recombination, in genetics, the process in which genetic material is exchanged between two similar or identical strands of DNA
Hypersensitive response, a mechanism used by plants to prevent the spread of infection by microbial pathogens
Hydroxyethylrutoside, a class of drugs
Hayati-Roberts link frame convention (HR), a robotics convention for representation of coordinates
<hr/>, an HTML element that creates a 'horizontal rule' or dividing line
Abbreviation for hour
Star catalogue symbol standing for Harvard observatory, Revised photometry

.hr - Internet country code top-level domain (ccTLD) for Croatia
- ISO 639 code for Croatian language
Hampton Roads, a region of south-eastern Virginia
Haryana, a state in northern India
High Representative of the Union for Foreign Affairs and Security Policy (High Representative), the foreign policy chief of the European Union
United States House of Representatives and all bills originating therefrom
HR postcode area, covering six post towns around Hereford, England
Bureau of Human Resources, in the U.S. Department of State

H.R. (b. 1956), lead singer of Bad Brains
Harley Race (b. 1943), retired pro wrestler, current promoter
Harold Reynolds (b. 1960), former major league baseball player, current commentator
Henry Rollins (b. 1961), American singer-songwriter, spoken word artist, actor, activist and publisher
Himesh Reshammiya (b. 1973), Indian composer, singer and actor
Hrithik Roshan (b. 1974), Indian actor

H.R. Pufnstuf, a children's television series
Haibane Renmei, an anime series
Halo Reach, a 2010 video game from Bungie Studios
Hannibal Rising (film), a 2007 thriller featuring the Hannibal Lecter character
Homestar Runner, a flash animated Internet cartoon
HR (girl group), a Japanese idol girl group
A television drama starring Alicia Silverstone
A criminal organisation in the American TV series Person of Interest

Human resource management (HRM, or simply HR), in the sense of personnel services in organisations
'High Risk', the lowest level of credit rating in some systems
Ukrainian hryvnia, the currency of Ukraine

Heritage railway, a term used for a railway which is run as a tourist attraction
Highland Railway, one of the smaller British railways before the Railways Act of 1921
'HR', IATA airline designator for Hahn Air
'HR', 1960s car model of Australian automaker Holden

'HR', abbreviation of 'human remains', a term used by entities such as funeral homes
Hessischer Rundfunk (Hessian Broadcasting) (HR), public broadcaster for the German state (Bundesland) of Hessen
Hispanic Review, an academic journal published by the University of Pennsylvania Press
Home run, in the sport of baseball
Human Rights, "Rights" and "Freedoms" to which all humans are entitled
⟨hr⟩, a two-letter combination used in some languages
- Reduction of /hr/ to /r/ in Old/Middle English