| G40 | Generation 40 
| Others |
| G4E | Google for Education
| Others |
| G4G | Games4Gameplay
| Others |
| G4G | Go For Good
| Others |
| G4L | Gangster For Life
| Others |
| G4L | Gaskets 4 Less
| Others |
| G4L | Ghost 4 Linux
| Others |
| G4L | Ghost for Linux
| Others |
| G4NP | Google for Non Profits
| Others |
| G4P | GUI for Processing
| Others |
| G4R | GaminG4Respect
| Others |
| G4S | Group 4 Securicor
| Others |
| G4S | Group 4 Security
| Others |
| G4U | Ghost for Unix
| Others |
| G4U | Good For You
| Others |
| G4V | Grid for Vehicles
| Others |
| G4W | Games for Windows
| Others |
| G5 | Civil Affairs at Corps and Division
| Others |
| G5S | Pontiac G5 Sport
| Others |
| G5SC | Group 5 Sports Car
| Others |
| G6PD | Glucose 6- Phosphate Dehydrogenase
| Others |
| G6PD | Glucose-6-Phosphate dehydeogenase Defficiency
| Others |
| G6PD | Glucose-6-phosphate-dehydrogenase
| Others |
| G6PDD | Glucose-6-phosphate dehydrogenase deficiency
| Others |
| G7 | Group of 7
| Others |
| G8 | Green channel image data (24bit 3D animation) (Cubicomp PictureMaker)
| Others |
| G8 | Group of 8
| Others |
| G8 | Raw graphics (one byte per pixel) plane three (PicLab)
| Others |
| G80 | Cancels any hole cycle
| Others |
| G81 | Simple drilling
| Others |
| G83 | Peck drilling
| Others |
| G84 | Right Hand Tapping
| Others |
| G8M | Galaxy 8 Mafia
| Others |
| G8R | Gator
| Others |
| G8R | Gator (University of Florida)
| Others |
| G9 | Goodnight
| Others |
| GA | Gabon
| Others |
| GA | Gaelic (Irish)
| Others |
| GA | GAge
| Others |
| GA | Galactic Adventures
| Others |
| GA | Gallium
| Element |
| GA | Gambler's Anonymous
| Others |
| GA | Gambling Act
| Others |
| GA | Gamer's Alliance
| Others |
| GA | Gamers Addicted
| Others |
| GA | Garuda And
| Others |
| GA | Gastric Analysis
| Others |
| GA | Gazillion Annum
| Others |
| GA | Gear Arena
| Others |
| GA | General Ability
| Others |