H.R. (Hunting Rod or Human Rights) (born 11 February 1956) is the stage name of Paul D. Hudson, the lead singer of the hardcore punk band Bad Brains. His vocal delivery is very diverse, ranging from a rapid-fire nasal whine, to feral growling and screeches, to smooth near-crooning or staccato reggae rhymes. He has departed the band periodically to pursue solo efforts that are more mellow reggae than Bad Brains' usual punk/metal offerings. He is the older brother of Earl Hudson, Bad Brains' drummer.

HR, Hr or hr may refer to:

• 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

H.R. (Hunting Rod or Human Rights) (born 11 February 1956) is the stage name of Paul D. Hudson, the lead singer of the hardcore punk band Bad Brains. His vocal delivery is very diverse, ranging from a rapid-fire nasal whine, to feral growling and screeches, to smooth near-crooning or staccato reggae rhymes. He has departed the band periodically to pursue solo efforts that are more mellow reggae than Bad Brains' usual punk/metal offerings. He is the older brother of Earl Hudson, Bad Brains' drummer.

HR, Hr or hr may refer to:

• 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