ETS is an abbreviation of:

• École de technologie supérieure, an engineering school in Montreal, Quebec, Canada
• Educational Testing Service, which administers tests such as SAT and GRE
• Emission Trading Scheme (see also European Union Greenhouse Gas Emission Trading Scheme (EU ETS))
• Endoscopic thoracic sympathectomy, a medical procedure
• Enhanced Traction System, a traction control system used by General Motors
• Environmental Tobacco Smoke, see tobacco smoking
• Episodic tremor and slip
• Escondido Tutorial Service, an online tutorial service for homeschooling families specializing in classical literature and mathematics. ^*
• Estimated Termination of Service or End of Time in Service - US Armed Forces
• European Telecommunication Standard
• Evangelical Theological Society
• Edmonton Transit System, the transit system in Edmonton, Alberta, Canada.

ETS