Others
- Commodity Trade Centre (CTC), Trusted Commodity Brokers
- Cambridge Temperature Concepts, a company based in the UK
- Carbon tetrachloride
- Chrysler Headquarters and Technology Center, the headquarters and engineering center for Chrysler LLC
- Caldera Thin Clients, a software company between 1998 and 1999 to develop DOS based thin-client solutions
- Celebrate the Century, a postage stamp series published by the United States Postal Service
- Centralized traffic control, a signalling system used by railroads
- Cerritos Towne Center
- Certified Transaction Coordinator (Real Estate)
- Chennai Trekking Club
- Chinese telegraph code
- Chlortetracycline
- Cholera Treatment Center (Haiti)
- Cinnamon Toast Crunch
- Closed timelike curve (general relativity)
- Communities That Care
- Community Tax Certificate
- Community technology center
- Computed tomographic colonography, an imaging modality of the colon using computed tomography
- Cornell Theory Center
- Cross the Canal
- Crush, Tear, Curl, or Cut, Twist, Curl, a method of processing tea
- Cut Throat City
- CTC (TV channel), a Russian television network
- CTC (TV station), in Canberra, Australian Capital Territory
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