| Abbreviation | Definition |
|---|---|
| GAF | Gothic Alien Foundation |
| GAS | Granary and Audio Sorcery |
| GATE | Global Agency for Threat Excision |
| GAT-X | Gressorial Armaments Tactical eXperimental |
| GB | Galactic Bloodshed |
| GBS | Glowing Black Stone |
| GC | Galactic Credit |
| GCFC | Grav Compensation Fire Control |
| GD | Greater Darkness |
| GDA | Global Defence Agency |
| GEC | Galaxy Exploration Command |
| GEORGE | Get Everyone On Robot Good Energy |
| GG | General Grievous |
| GGS | Gotta Get Starcraft |
| GH | Grinning Hellion |
| GIC | G.I. Cobra Clan |
| GIRL | Genetically Inferior Retarded Lifeform |
| GITS | Ghost In The System |
| GKM | Giant Killer Mecha |
| GKR | Great King Rats |