QS

QS may refer to:

Business

 * QS mark (for "quality and safety"), on Chinese products
 * Quacquarelli Symonds, an education and careers networking company
 * QS World University Rankings, an annual publication
 * Quality System (QS) Regulation, a business process
 * Quantity surveyor, a professional in the construction industry concerned with costs and contracts
 * Travel Service (IATA airline designator QS)
 * Quadraphonic sound, the Sansui QS Regular Matrix system

Politics

 * Québec solidaire, a political party in Quebec, Canada
 * Quis separabit?, an Irish Loyalist motto

Biology and medicine

 * ATCvet code QS Sensory organs, a section of the Anatomical Therapeutic Chemical Classification System for veterinary medicinal products
 * Quantum satis, a Latin term meaning "the amount which is needed", used in food and drug regulation
 * Quinolinate synthase, an enzyme
 * Quorum sensing, a system of interaction in natural and synthetic populations

Computing and mathematics

 * Quadratic sieve, an integer factorization algorithm
 * Quality Score, a variable used by search engines to set the rank and cost of ads
 * Quicksort, a sorting algorithm

Other uses in science and technology

 * Quadraphonic sound, or "Quadphonic Synthesizer", a matrix quadraphonic gramophone record format developed by Sansui
 * Quantified self, a movement to incorporate technology into data acquisition on aspects of a person's daily life
 * Quicksand, a colloid hydrogel consisting of fine granular material and water

Sport

 * Quality start, a baseball statistic calculated for starting pitchers
 * Qualcomm Stadium, a stadium in San Diego, California

Other uses

 * Queen's Scout, a scout who has attained the Queen's Scout Award
 * Queen's Serjeant, an obsolete legal position in the United Kingdom