| Abbreviation | Definition |
|---|---|
| GSOI | Greenstone Support Organization for India |
| GSOL | Get Safe On-Line |
| GSS | Golden State Society |
| GSSF | Glock Shooting Sports Foundation |
| GSWA | Great Swamp Watershed Association |
| GT | Grant Thornton Toastmasters Club |
| GTA-CAC | Greater Toronto Area Clean Air Council |
| GTBayYMCA | Grand Traverse Bay Young Men's Christian Association |
| GTPN | Global Tibetan Proffesional Network |
| GTUL | Greater Toledo Urban League |
| GUD | Grand Unified Debugger |
| GV | Global Volunteers |
| GVA | Gillani's Volunteer Association |
| GVE | Global Village Engineers |
| GVEF | Genesee Valley Earth First |
| GVEF | Greater Victoria Eldercare Foundation |
| GVTA | Grand Valley Trails Association (Ontario, Canada) |
| GWCF | George Washington Crossing Foundation |
| GWCI | George Washington Carver Institute |
| GWCO | Great Woods Chamber Orchestra |