CTX
- C-terminal telopeptide
- CTX (camera)
- CTX (computer virus)
- CTX (explosive-detection device)
- Caltex
- Cefotaxime
- Ceftriaxone
- Centrex
- Cerebrotendineous xanthomatosis
- Charybdotoxin
- Chemotherapy
- Cholera toxin
- Chuntex Electronic
- Ciguatoxin
- Citrix Systems
- Concordia University Texas
- Conotoxin
- Cortland, New York
- Critical to X
- Crotoxin
- Cyclophosphamide
- Dinosaur (Disney's Animal Kingdom)