QR may stand for:

• Quintana Roo (company), a triathlon-specific wetsuit and bicycle company
• Karakalpakstan (Qoraqalpog'iston Respublikasi), Uzbekistan, under ISO 3166-2 subcode UZ-QR
• Nippon Cultural Broadcasting, inc., a radio network in Tokyo, Japan, abbreviated "QR" from call sign JOQR
• Nissan QR engine
• Provisional designation in astronomy, which uses "QR" as the suffix for the 17th object found in the second half of August in a given year
• Quarterly Review
• Qatar Airways, as IATA code QR
• Queen's Radio, Student Radio station at Queen's University Belfast
• Queensland Rail, QR Limited, the company government-owned corporation responsible for the operation and maintenance of the railway system in Queensland, Australia
• Queen's Rangers
• Quick release
• Quiet Riot, a heavy metal band
• QR Code, a two-dimensional bar code
• In mathematics:
  • QR algorithm, an eigenvalue algorithm
  • QR decomposition, a decomposition of a matrix into an orthogonal and a triangular factor
  • Quadratic reciprocity

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