| Abbreviation | Definition |
|---|---|
| GIKA | Gifts In Kind America |
| GIKC | Gifts In Kind Center |
| GIKI | Gifts In Kind International |
| GIRA | Georgetown International Relations Association, Inc. |
| GISO | Georgia Iranian Student Organization |
| GITTA | Geographic Information Technology Training Alliance |
| GIWO | Grace International World Outreac |
| GJIRWF | Gem & Jewelry Internet Research World Federation |
| GK | Gawad Kalinga |
| GKI | Gifts In Kind International |
| GKP | Global Knowledge Partnership |
| GKTW | Give Kids The World |
| GLA | Gifted Learning Association |
| GLAAD | Gay And Lesbian Alliance Against Defamation |
| GLCF | Great Lakes Center Foundation |
| GLHF | Great Lakes Hemophilia Foundation |
| GLI | Gabbys Ladder, Inc. |
| GLOBAL | Great Lakes Organization of Building Associates Land |
| GLUL | Greater Lansing (Michigan) Urban League |
| GLWC | Great Lakes Wind Collaborative |