CG
- .cg
- Board for Certification of Genealogists
- Carbon group
- Categorial grammar
- Center of mass
- Centigram
- Central of Georgia Railway
- Ceremonial Guard (Canada)
- Cg (programming language)
- Chaotic good
- Chappe et Gessalin
- Character generator
- Chaudhary Group
- Chhattisgarh
- Chorionic gonadotropin
- Cigna
- Classical guitar
- Clock gating
- Cloud-to-ground lightning
- Coast guard
- Coherency Granule
- Colorado General
- Commandant-General
- Commanding General
- Common Ground (NYC)
- Community Games
- Complete game
- Computational geometry
- Computer graphics
- Computer-generated imagery
- Conceptual graph
- Conjugate gradient method
- Constraint Grammar
- Corporate Governance
- Crna Gora
- Cypress Gardens
- Democratic Republic of the Congo
- East West MRT Line
- Galician Coalition
- Galician Convergence
- List of cruisers of the United States Navy
- PNG Air
- Phosgene
- Republic of the Congo
- The Carlyle Group