CGA
- California's Great America
- Canadian Gemmological Association
- Canadian Global Almanac
- Casual Games Association
- Central of Georgia Railway
- Certified General Accountant
- Ceylon Garrison Artillery
- Charitable gift annuity
- Chinese Golf Association
- Chinese Gymnastics Association
- Chlorogenic acid
- Chorionic gonadotropin alpha
- Chromogranin A
- Coast Guard Administration
- Color Graphics Adapter
- Community of the Glorious Ascension
- Composite Gazetteer of Antarctica
- Compressed Gas Association
- Computer animation
- Conformal geometric algebra
- Confédération générale de l'agriculture
- Connecticut General Assembly
- Consumer Guarantees Act
- Controller General of Accounts
- Coordination of Anarchist Groups
- Corner Gas Animated
- Cryptographically Generated Address
- Education Workforce Council
- United States Coast Guard Academy
- United States Coast Guard Auxiliary