CES
- CES (trade show)
- Camurati-Engelmann disease
- Carboxylesterase
- Caspian Engineers Society
- Cauda equina syndrome
- Center for Economic Studies
- Center for Election Science
- Center for Ethical Solutions
- Central South station
- Centre for Environmental Studies
- Centre for European Studies (disambiguation)
- Cessnock Airport
- Character encoding
- Charge-exchange spectroscopy
- China Eastern Airlines
- Church Educational System
- Circuit Emulation Service
- Closed ecological system
- Coalition for Economic Survival
- Coalition of Essential Schools
- Commonwealth Employment Service
- Community Exchange System
- Confédération Européenne de Scoutisme
- Constant elasticity of substitution
- Cranial electrotherapy stimulation
- Cressing railway station
- Cryogenic energy storage
- Czech language
- Jean Ces