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 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 and Żurrieq.

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.

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

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.