CGC
- CB Gran Canaria
- CGC Japan
- CGCOC Group
- Cambridge Gliding Centre
- Camparini Gioielli Cup
- Canada Games Centre
- Canadian Grain Commission
- Canine Good Citizen
- Canopy Growth Corporation
- Capital Group Companies
- Certified Guaranty Company
- Chen Guangcheng
- China Geo-Engineering Corporation
- Color-glass condensate
- Commonwealth Grants Commission
- Conspicuous Gallantry Cross
- Constrained geometry complex
- Consumer generated media
- Cyber Grand Challenge
- General contractor
- Genetic counseling
- United States Coast Guard Cutter