| Abbreviation | Definition |
|---|---|
| GLWR | Great Lakes Weimaraner Rescue |
| GLWR | Greyhound and Lurcher Welfare Rescue |
| GMB | General Membership Branch |
| GMC | Green Mountain Club |
| GMOM | Get Money Out Maryland |
| GMSFP | George Mason Society Freedom Project |
| GMSMA | Gay Male S/M Activists |
| GMSS | Gem and Mineral Society of Syracuse |
| GMST | Ghanshyam Manav Seva Trust |
| GNAA | Government and Nonprofit Accounting and Auditing |
| GNAC | Governmental and Nonprofit Assistance Center |
| GNDF | Good News Development Fellowship |
| GNDF | The Good News Doctor Foundation |
| GNI | Gay Naturists International |
| GNO | Government and Nonprofit Organization |
| GO2S | Guided Optics Sensor Systems |
| GO2S | Guided Optics & Sensor Systems |
| GODART | Government Documents Round Table of the American Library Association |
| GOF | Gun Owners Foundation |
| GOGIRLS | Giving Our Girls Inspiration and Resources for Lasting Self-esteem |