CT
- Academic quarter (class timing)
- C/T Group
- COVID-19 test
- CT (TV channel)
- CT Corp
- CT Corporation
- CT Value
- CT postcode area
- CT scan
- Calcitonin
- Calgary Transit
- Calibrated automated thrombogram
- Canadian Tire
- Canton and Enderbury Islands
- Cape Town
- Carat (mass)
- Carat (purity)
- Cardiothoracic surgery
- Carrick Times
- Center tap
- Centime
- Central African Republic
- Central Time Zone
- Central Trains
- Central tendon (disambiguation)
- Certificate Transparency
- Champions Trophy (disambiguation)
- Chelation therapy
- Chemotherapy
- Chemotype
- Chinese Taipei
- Cholera toxin
- Christianity Today
- Civil Air Transport
- Coffin Texts
- Cognitive therapy
- Community Transit
- Compliant Tower
- Comunión Tradicionalista
- Connecticut
- Connective tissue
- Conspiracy theory
- Continuous-time signal
- Convective temperature
- Counter-terrorism
- Crawler-transporter
- Cryptologic technician
- Current transformer
- Cybertruck
- Czech Television
- Haplogroup CT
- Honda CT series
- Intel Ct
- Lexus CT
- List of Red vs. Blue characters
- Province of Catania
- Stotinki
- Training cruiser