| G.C.B. | Knight Grand Cross, Order of the Bath 
| Others |
| GCB | Galant Clube Brasil
| Others |
| GCB | Galaxie Clube Do Brasil
| Others |
| GCB | Gambian Central Bank
| Others |
| GCB | Gambling Control Board
| Others |
| GCB | Gaming Control Board
| Others |
| GCB | Gas Circuit Breaker
| Others |
| GCB | Gas Circuit Breakers
| Others |
| GCB | Gauteng Cricket Board
| Others |
| GCB | General Classroom Building
| Others |
| GCB | General Conditions of Business
| Others |
| GCB | Generator Circuit Breaker
| Others |
| GCB | Generator Circuit Breakers
| Others |
| GCB | Generator Control Breaker
| Others |
| GCB | Genomics and Computational Biology
| Others |
| GCB | Genomics Comp Biology
| Others |
| GCB | Georgia Community Bank
| Others |
| GCB | German Conference on Bioinformatics
| Others |
| GCB | German Convention Bureau
| Others |
| GCB | Germinal Center B
| Others |
| GCB | Get Current Block
| Others |
| GCB | Ghana Commercial Bank
| Others |
| GCB | Global Change Biology
| Others |
| GCB | Global Configuration Block
| Others |
| GCB | Global Consumer Bank
| Others |
| GCB | Global Consumer Banking
| Others |
| GCB | Global Corruption Barometer
| Others |
| GCB | Glorified College Boys
| Others |
| GCB | Golden City Brewery
| Others |
| GCB | Good Christian Belles
| Others |
| GCB | Good Christians Belles
| Others |
| GCB | Google Cardboard
| Others |
| GCB | Google Chrome Backup
| Others |
| GCB | Google Chrome Browser
| Others |
| GCB | Google Chromebook
| Others |
| GCB | Google Cloud Build
| Others |
| GCB | Goon City Bros
| Others |
| GCB | Grad Center Bar
| Others |
| GCB | Graduate Center Bar
| Others |
| GCB | Graduate School for Cellular and Biomedical Sciences
| Others |
| GCB | Grand Commander of the Bath
| Others |
| GCB | Grand Conseil de Bordeaux
| Others |
| GCB | Granite Community Bank
| Others |
| GCB | Graphitized Carbon Black
| Others |
| GCB | Great Canadian Birdathon
| Others |
| GCB | Greater Cincinnati Behavioral Health Services
| Others |
| GCB | Green and Clean Business
| Others |
| GCB | Grilled Cheese Bar
| Others |
| GCB | Grizzly City Boy
| Others |
| GCB | Guernsey Cricket Board
| Cricket |
| GCB | Gun Control Box
| Others |
| GCB | Guyana Cricket Board
| Others |
| GCB | Knight Grand Cross
| Others |
| GCB | Minnesota Gambling Control Board
| Others |