| Abbreviation | Definition |
|---|---|
| GBCT | Guild of British Camera Technicians |
| GBNI | Guild Basic Needs IndexTM |
| GBW | Guild of Book Workers |
| GCBG | Georgia Craft Brewers Guild |
| GCNA | Guild of Carillonneurs in North America |
| GCRAG | Greater Castle Rock Art Guild |
| GCSD | Guilderland Central School District |
| GDD | Guilde des Doctorants |
| GEC | Guild for Exceptional Children |
| GFFG | Gothenburg Free Fencers Guild |
| GFPA | Guild of Film Production Accountants |
| GGAC | Geelong Guild Athletic Club |
| GGFO | Guild Of Gas Fitting Operatives |
| GGOH | Guild of the Grumpy Old Hackers |
| GIAA | Guild of Italian American Actors |
| GLC | Guild Leader Collaboration |
| GM | Guild Medieval |
| GMS | Guild Message System |
| GNT | guild novice talk |
| GOCB | Guild of Church Braillists |