| Council of Graduate Students | Academic & Science |
| Carolina Geological Society | Academic & Science |
| Société canadienne de géotechnique | Academic & Science |
| Canadian Geotechnical Society | Academic & Science |
| China Geophysical Society | Academic & Science |
| 中国地球物理学会 | Academic & Science |
| Zhōngguó Dìquíwùlǐ Xuéhuì | Academic & Science |
| Česká Geografická Společnost | Academic & Science |
| Czech Geographical Society | Academic & Science |
| California Genealogical Society | Academic & Science |
| Comparative Gastroenterology Society | Academic & Science |
| Center for Gender Studies | Academic & Science |
| Crafts Games and SCIENCE | Academic & Science |
| Credit Gain Services | Accounts and Finance |
| Cost of Goods Sold | Accounts and Finance |
| College Park (md) | Airport Code |
| CEC Resources, LTD. | Business |
| Chris Graham Software | Business |
| Core Graphics Services | Business |
| Computer Generated Solutions, Inc. | Business |
| Castings | Business |
| Cogstate Ltd | Business |
| Crescent Girls School | Community |
| Costeas Geitonas School | Community |
| Common Ground Sanctuary | Community |
| Citizens for Global Solutions | Community |
| Canberra Grammar School | Community |
| Camberwell Grammar School | Community |
| Commonwealth Governor's School | Community |
| Color Graphics System | Computer Hardware |
| Championship Gaming Series | Computing |
| Corel Graphics Suite | Computing |
| Computer Graphics Society | Computing |
| Cim Based Grid Schema | Computing |
| Compressed Graphics Streaming | Computing |
| Computer Gaming Service | Computing |
| Cloud Gaming Service | Computing |
| Cloud Gaming System | Computing |
| Character Generators | Computing |
| Computer Generated Solutions | Computing |
| China Glassware Silverware | Country Specific |
| Cougar | Cryptocurrency |
| Crypto Gladiator Shards | Cryptocurrency |
| Committee On Geological Sciences | Earth Science |
| College of General Studies | Educational Institute |
| Centimeters Grams and Seconds | General |
| Centimeter Gram and Second | General |
| Centimetre Gram Second | General |
| China Geological Survey | General |
| Continuous Grain Silicon | General |
| Customer Grid Supply | General |
| Creative Graphic Services | General |
| Credibility Guarantee Schedule | General |
| Chris Georges Sales | General |
| Core Graphics System | General |
| Chris George Sales | General |
| Clyde Green Springs | General |
| CUSIP Global Services | General |
| Crypted Group Share | General |
| Clutchless Gear System | General |
| Coupe Grand Sport | General |
| Citroen Grande Serie | General |
| Corvette Grand Sport | General |
| Coussins Gonflables de Securite | General |
| Cougar Gs | General |
| Charlotte Gaming Society | General |
| Clay Guardian Shield | General |
| Come Get Some | General |
| California Geological Survey | General |
| Comtel Global Services | General |
| Contemporary Guidance Services | General |
| California Geographical Society | Geography |
| Council of Graduate Schools | Governmental |
| Canadian Geodetic Survey | Governmental |
| Center for Governmental Studies | Governmental |
| Center for Government Studies | Governmental |
| Colecţia liceului German din Sighişoara | International |
| Conjugate Gradient Squared | Maths |
| Centimetre-gram-second [cf. Fps and Mks] | Measurement Unit |
| Centimeter Gram Second | Measurement Unit |
| Clinical Guidelines Subcommittee | Medical |
| Catgut Suture | Medical |
| Conus (continental United States) Ground Station | Military and Defence |
| Chief of General Staff (canada) | Military and Defence |
| Chief of General Staff (british Army) | Military and Defence |
| Common Ground Station | Military and Defence |
| Canadian Government Ship | Military and Defence |
| Centimetre-gram-second [cf. Mks and Fps] | Physics Related |
| College Park Airport, College Park, Maryland USA | Regional |
