QR

QR may refer to:

Arts and entertainment

• Nippon Cultural Broadcasting (from call sign JOQR), a Tokyo radio station
• Queen's Radio, a student radio station at Queen's University Belfast
• Quiet Riot, an American rock band

Businesses

• Qatar Airways (IATA code)
• Queensland Rail, a company responsible for the railway system in Queensland, Australia
• Quintana Roo (company), a triathlon-specific wetsuit and bicycle company

Places

• Quintana Roo, a state of Mexico
• Karakalpakstan (Qoraqalpog'iston Respublikasi), Uzbekistan (ISO 3166-2 subcode UZ-QR)

Science and technology

• QR code (Quick Response code), a two-dimensional code
• ATCvet code QR Respiratory system, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
• DICOM Q/R, DICOM Query / Retrieve
• Nissan QR engine

Mathematics

• QR decomposition, a decomposition of a matrix
  • QR algorithm, an eigenvalue algorithm to perfotm QR decomposition
• Quadratic reciprocity, a theorem from modular arithmetic
• Quasireversibility, a property of some queues
• Reaction quotient (Q_r), a function of the activities or concentrations of the chemical species involved in a chemical reaction

Other uses

• Quarterly Review, a defunct literary and political periodical
• Qatari riyal, the currency of Qatar