QS

QS may refer to:

Business

• QS mark (for "quality and safety"), on Chinese products
• Quacquarelli Symonds, an education and careers networking company
• 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

Science, technology, and mathematics

Health 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

Mathematics

• Quadratic sieve, an integer factorization algorithm
• Quicksort, a sorting algorithm

Other uses in science and technology

• Quadraphonic sound, or "Quadphonic Synthesizer", a matrix quadraphonic gramophone record format developed by Sansui
• Quality Score, a variable used by search engines to set the rank and cost of ads
• 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
• Quorum sensing, a system of interaction in natural and synthetic populations

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
• QS World University Rankings, an annual publication