CTG
- CTG Collective
- Cardiotocography
- Center for Technology in Government
- Central Economic Society for the Grand Duchy of Poznań
- Channel Technologies Group
- Channel Tunnel Group
- China Three Gorges Corporation
- Chittagong
- Chittagonian language
- Close the Gap
- Color TV-Game
- Computer Task Group, Incorporated
- Cotangent
- Counter Terrorism Group
- List of airline codes (C)
- Open Environment Corporation
- Rafael Núñez International Airport
- The Counterterrorism Group, Inc.
- United States Tenth Fleet
- Vietinbank