| Abbreviation | Definition |
|---|---|
| GASC | Global Association of SoL Communities |
| GASH | Gloucestershire Association of Secondary Headteachers |
| GASN | Georgia Association of School Nurses |
| GASN | Glendale Association of Student Nurses |
| GASP | Graduate Association for Students in Psychology |
| GASR | Global Aviation Safety Roadmap (International Air Transport Association) |
| GASSP | Georgia Association Of Scientific Studies Of The Paranormal |
| GAST | Ghana Association of Science Teachers |
| GAT | Genomic Association Tester |
| GATA | Garbage Anti Truth Association |
| GATA | Gates of Arlington Tenants Association |
| GATA | Georgia Academic Team Association |
| GATA | Greater Atalanta Telugu Association |
| GATA | Greater Atlanta Telugu Association |
| GATA | Guildford Amateur Theatre Association |
| GATS | Global Association of Theological Studies |
| GATT | Global Association for Temporary Tariffs |
| GATTA | Ghana Association of Travel and Tourist Agents |
| GAWM | Gujarati Association of Western Massachusetts |
| GAYA | Great Austral Young Association |