CTC may stand for:
- Calcutta Tramways Company
- California Tomato Commission
- Canada Tibet Committee
- Canadian Tire Corporation
- Canadian Tourism Commission
- Carbon tetrachloride
- Celebrate the Century (USPS)
- Central Texas College
- Centralized traffic control
- Center for Technology Commercialization (NASA, ctc.org)
- Center for Training and Consultancy (Georgia, ctc.org.ge)
- Centro Tecnológico do Calçado (Portugal)
- Certified travel counselor
- Chlortetracycline
- Closed timelike curve (general relativity)
- Colorado Tree Coalition
- Combat training center
- California Commission on Teacher Credentialing (ctc.ca.gov)
- Committee on Teaching of Chemistry (IUPAC)
- Clear tomato concentrate
- Common Toxicity Criteria
- Community technology center
- Concurrent Technologies Corporation (ctc.com)
- Cornell Theory Center
- Counter-Terrorism Committee (UN)
- Counter-Terrorist Center (CIA)
- Cryptologic Technician Communications (US Navy rating)
- Cylists' Touring Club (ctc.org.uk)
- CT Communications (ctc.net)