CES

• Circuit Emulation Service, a telecommunication technology • Cryogenic energy storage • Character encoding scheme, a reversible transformation of sequences of code units to sequences of bytes • Charge-exchange spectroscopy, a diagnostic used in plasma physics ==Companies==

• ICAO Code designator for China Eastern Airlines ==Medicine==

• Cauda equina syndrome, a serious neurological condition • Cranial electrotherapy stimulation, therapeutic brain stimulation • Camurati-Engelmann disease, also called "Camurati Engelmann syndrome" (CES) • Carboxylesterase, an enzyme that catalyzes the reaction between a carboxylic ester and water ==Organizations==

• Caspian Engineers Society • Center for Economic Studies, University of Munich • Center for Ethical Solutions, bioethics think tank in the United States • Centre for Environmental Studies, former UK research organization • Church Educational System, of The Church of Jesus Christ of Latter-day Saints • Coalition for Economic Survival, a Los Angeles–based community organization • Coalition of Essential Schools, US educational reform • Community Exchange System, international Internet trading network • Commonwealth Employment Service, former Australian Government employment agency • Confédération Européenne de Scoutisme or Confederation of European Scouts • Consumer Electronics Show, an annual technology trade show in Las Vegas, Nevada, United States • Centre for European Studies (disambiguation), the name of several educational institutions • Center for Election Science, a US-based approval voting advocacy organization ==People==

• Jean Ces, French boxer of the 1920s ==Transportation==

• Central South station, a proposed MTR station in Hong Kong • Cessnock Airport, IATA airport code "CES" • Cressing railway station, British railway station with station code CES ==Other uses==

• Closed ecological system, isolated from the outside • Clean Energy Standards, part of the climate change policy of the United States • Constant elasticity of substitution, in economics, a feature of a particular class of production function • The ISO 639 code for the Czech language