QR may stand for:

QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed in 1994 for the automotive industry in Japan.

In linear algebra, a QR decomposition (also called a QR factorization) of a matrix is a decomposition of a matrix A into a product A = QR of an orthogonal matrix Q and an upper triangular matrix R.

The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram (EKG or ECG).

Qrendi (Maltese: Il-Qrendi) is a small village in the Southern Region of Malta, with a population of 2752 people as of March 2014. It is located close to Mqabba Żurrieq and Siggiewi.

QRpedia is a mobile Web-based system which uses QR codes to deliver Wikipedia articles to users, in their preferred language.

Lee Ji-hyun (Hangul: 이지현; born December 12, 1986), better known by her stage name Qri, is a South Korean singer and actress.

In amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range.

In numerical linear algebra, the QR algorithm is an eigenvalue algorithm: that is, a procedure to calculate the eigenvalues and eigenvectors of a matrix.

QRICH1, also known as Glutamine-rich protein 1, is a protein that in humans is encoded by the QRICH1 gene.