| C&GS | Office of Charting and Geodetic Services 
| Others |
| CGS | California Genealogical Society
| Others |
| CGS | California Geographical Society
| Others |
| CGS | California Geological Survey
| Others |
| CGS | Camberwell Grammar School
| Others |
| CGS | Canadian Geodetic Survey
| Others |
| CGS | Canadian Geotechnical Society
| Others |
| CGS | Canadian Government Ship
| Others |
| CGS | Canberra Grammar School
| Others |
| CGS | Carolina Geological Society
| Others |
| CGS | Catgut Suture
| Others |
| CGS | Center for Gender Studies
| Others |
| CGS | Center for Government Studies
| Others |
| CGS | Center for Governmental Studies
| Others |
| CGS | Centimeter Gram and Second
| Others |
| CGS | Centimeter Gram Second
| Others |
| CGS | Centimeter, Gram, Second
| Others |
| CGS | Centimeters Grams and Seconds
| Others |
| CGS | Centimetre Gram Second
| Others |
| cgs | centimetre-gram-second [cf. fps and mks]
| Others |
| cgs | centimetre-gram-second [cf. mks and fps]
| Others |
| CGS | Championship Gaming Series
| Others |
| CGs | Character Generators
| Others |
| CGS | Charlotte Gaming Society
| Others |
| CGS | Chief of General Staff (British Army)
| Others |
| CGS | Chief of General Staff (Canada)
| Others |
| CGS | China Geological Survey
| Others |
| CGS | China Geophysical Society
| Others |
| CGS | China Glassware Silverware
| Others |
| CGS | Chris George Sales
| Others |
| CGS | Chris Georges Sales
| Others |
| CGS | Chris Graham Software
| Others |
| CGS | Cim Based Grid Schema
| Others |
| CGS | Citizens for Global Solutions
| Others |
| CGS | Citroen Grande Serie
| Others |
| CGS | Clay Guardian Shield
| Others |
| CGS | Clinical Guidelines Subcommittee
| Others |
| CGS | Cloud Gaming Service
| Others |
| CGS | Cloud Gaming System
| Others |
| CGS | Clutchless Gear System
| Others |
| CGS | Clyde Green Springs
| Others |
| CGS | College of General Studies
| Others |
| CGS | College Park Airport, College Park, Maryland USA
| Others |
| CGS | Color Graphics System
| Others |
| CGS | Come Get Some
| Others |
| CGS | Committee on Geological Sciences
| Others |
| CGS | Common Ground Sanctuary
| Others |
| CGS | Common Ground Station
| Others |
| CGS | Commonwealth Governor's School
| Others |
| CGS | Comparative Gastroenterology Society
| Others |
| CGS | Compressed Graphics Streaming
| Others |
| CGS | Computer Gaming Service
| Others |
| CGS | Computer Generated Solutions
| Others |
| CGS | Computer Generated Solutions, Inc.
| Others |
| CGS | Computer Graphics Society
| Others |
| CGS | Comtel Global Services
| Others |
| CGS | Conjugate Gradient Squared
| Others |
| CGS | Contemporary Guidance Services
| Others |
| CGS | Continuous Grain Silicon
| Others |
| CGS | CONUS (CONtinental United States) Ground Station
| Others |
| CGS | Core Graphics Services
| Others |
| CGS | Core Graphics System
| Others |
| CGS | Corel Graphics Suite
| Others |
| CGS | Corvette Grand Sport
| Others |
| CGS | Costeas Geitonas School
| Others |
| CGs | Cougar Gs
| Others |
| CGS | Council of Graduate Schools
| Others |
| CGS | Council of Graduate Students
| Others |
| CGS | Coupe Grand Sport
| Others |
| CGS | Coussins Gonflables de Securite
| Others |
| CGS | Crafts Games and SCIENCE
| Others |
| CGS | Creative Graphic Services
| Others |
| CGS | Credibility Guarantee Schedule
| Others |
| CGS | Credit Gain Services
| Others |
| CGS | Crescent Girls School
| Others |
| CGS | Crypted Group Share
| Others |
| CGS | CUSIP Global Services
| Others |
| CGS | Customer Grid Supply
| Others |
| CGS | Czech Geographical Society
| Others |