QR

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