QN

QN or qn may refer to:
 * Qn, one of several robust measures of scale in statistics
 * ATCvet code QN Nervous system, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
 * QN connector, a type of coaxial RF connector
 * Queen's Nurse (QN), an honorary title awarded by the Queen's Nursing Institute (QNI) to community nurses
 * Queen regnant (Qn.), in the Christian Church, following the name of a Christian saint who was a Queen
 * Queer Nation (QN), a United States LGBT social movement
 * Quintillion (qn), a large number