HR, Hr, or hr may stand for:

• hour (common abbreviation)
• Croatia (ISO country code HR: from the native name Hrvatska). See also: .hr.
• Croatian language (ISO 639 alpha-2, hr)
• Hahn Air IATA airline designator
• Healthcare Realty Trust, Inc. (NYSE symbol HR)
• Hertzsprung-Russell a star classification scheme
• Hell Raisers, a spirit group at the University of Texas at Austin.
• Hell Raisers are also a group of marching band students at Lyndon B. Johnson High School in Austin, Tx who aid in pre and post football game set up (i.e. placing water coolers in the stands).
• Hessischer Rundfunk, German broadcasting authority in Hesse
• Highland Railway
• High Resolution High Definition, an Internet television encoding standard.
• <hr> HTML tag that creates a 'horizontal rule' - a horizontal dividing line.
• H.R., singer of "Bad Brains"
• home run in the sport of baseball.
• Homestar Runner, a character and website based on a parody of a children's book.
• House of Representatives in the United States.
• "House of Representatives bill," abbreviation used as a prefix before the legislative bill numbers processed through the United States Congress.
• Human resources, in the field of corporate management.
• Harvard observatory, Revised photometry, a star catalogue

HR | HR | Hr | HR | HR | Hr | HR | HR | HR | Hr