| Corrugated Galvanised Iron | Academic & Science |
| Chulabhorn Graduate Institute | Academic & Science |
| California Graduate Institute | Academic & Science |
| Certified Genealogical Instructor | Academic & Science |
| Center for Geographic Information | Academic & Science |
| Cape Girardeau (mo) | Airport Code |
| Catholic Guides of Ireland | Associations & Organizations |
| Commission for the Management and Application of Geoscience | Associations & Organizations |
| Consultative Group on Indonesia | Associations & Organizations |
| Certificate for General Insurance | Business |
| Conseillers en Gestion et Informatique | Business |
| Compagnie Générale Immobiliere | Business |
| Commerce Group, Inc., of Massachusetts | Business |
| Canadian General Investments | Business |
| Canadian General Investments, Limited | Business |
| Consolidated Global Investments, LTD. | Business |
| Career Growth Initiative | Business |
| Charged Gasoline Injection | Chemistry |
| Computer Graphics International Conference | Community |
| Catholic Guides of Ireland (Girl Guides) | Community |
| Church of God International | Community |
| Control Grid Interpolation | Computer and Networking |
| Cascading Gate Interaction | Computer Hardware |
| Computer Graphics Interface | Computer Hardware |
| Computer Graphics Imagery | Computing |
| Cell Global Identifier | Computing |
| Color Graphics Interface | Computing |
| Computer Generated Illustration | Computing |
| Compagnie Generale d'Informatique | Computing |
| Computer Graphic Interface | Computing |
| Computer Graphics Imaginary | Computing |
| Computer Generated Imaging | Computing |
| Computer Generated Image | Computing |
| Common Gateway Interface Script | File Type |
| Cardboard and Gum Imagery | General |
| Combustible Gas Indicator | General |
| Clever Gnome Imagery | General |
| Compacted Graphite Iron | General |
| Common Rail Gasoline Injection | General |
| Clean Gas Induction | General |
| Chrysler Group International | General |
| Crappy Graphics Interface | General |
| For Common Gateway Interface | General |
| Come and Get It | General |
| Cognitively Guided Instruction | General |
| Common Global Implementation | General |
| Coast Guard Intelligence | Governmental |
| Cuerpo Guardia de Infantería | Governmental |
| Clinton Global Initiative | Governmental |
| CHANDRAGIRI | Indian Railway Station |
| Common Gateway Interface | Information Technology |
| Computer-Generated Imagery | Information Technology |
| Computer Graphics International | International |
| Coinsinos Global International | International |
| Clive GIbbons | Internet |
| Can't Get It | Internet |
| Cancer Genetics Inc | Medical |
| Cancer Genome Interpreter | Medical |
| Clinical Global Impression | Medical |
| Clinical Global Impressions | Medical |
| Cape Girardeau, Missouri USA | Regional |
| East Canada, Greenland and Iceland | Regional |
| Computer Generated Images | Softwares |
| Computer Graphics Imaging | Softwares |
| Confederation of Golf in Ireland | Sports |
| Cell Global Identity | Telecommunication |
| Cape Girardeau Regional Airport | Transport & Travel |