| Abbreviation | Definition |
|---|---|
| GSSA | Georgia School Superintendents Association |
| GSSA | Global Singers and Songwriters Association |
| GSTA | Garden State Towing Association |
| GTAA | Greater Toronto Apartment Association |
| GTMA | Getting The Message Across |
| GTMA | Greater Toronto Marketing Alliance |
| GTMC | Guild of Travel Management Companies |
| GTSWCA | Greater Toronto Sewer and Watermain Contractors' Association |
| GUA | Georgia Underwriting Association |
| GUHT | Grampian University Hospitals Trust |
| GVEA | Golden Valley Electric Assn |
| GVEA | Golden Valley Electric Association |
| HA | Heritage Association |
| HA | Hydrocephalus Association |
| HAA | Home Automation Association |
| HABC | Hawaii Asset Building Coalition |
| HACA | Haitian American Community Association |
| HACR | Hispanic Association for Corporate Responsibility |
| HACS | Hawaii Association Of Charter Schools |
| HACT | Housing Association Charitable Trust |