| Abbreviation | Definition |
|---|---|
| GLaDOS | Genetic Life-form and Disk Operating System |
| GLOR | Grey Lodge Occult Review |
| GLOVE | Global League of Villainous Enterprise |
| GLS | Great Lake Savants |
| GLU | Gods Like Us |
| GM | Gundam Mass |
| GMF | Galactic Military Forces |
| GMK | Godzilla, Mothra, and King |
| GMO | Galactic Money Organizer |
| GMT | Galaxy Mean Time |
| GOA | Guild Of Avalon |
| GOD | Guardians Of Darkness |
| GOE | Goddess Of Eternity |
| GOE | Guardians Of Earth |
| GOH | Gatekeeper Of Hell |
| GOH | Gods Of Hellfire |
| GOT | Galaxy Of Terror |
| GP | Galaxy Police |
| GR | Giant Robot |
| GRA | Growing Robotic Arm |