| Games Faction |
| Games Farm |
| Gamigo |
| Gaming Minds |
| Garage Games |
| Gas Powered Games |
| Gastronaut Studios |
| Gathering of Developers |
| Gearbox Software |
| GenePool |
| Genki |
| Genuine Games |
| Giant Sparrow |
| Global Star |
| GlyphX Games |
| GMX Media |
| Good-Feel |
| Gorilla Systems |
| Got Game Entertainment |
| Gotham Games |
| Graffiti Entertainment |
| Graphsim Entertainment |
| Grasshopper Manufacture |
| Gratuitous Games |
| Gravity |
| Gray Matter Studios |
| GreenScreen Interactive Software |
| Greenwave |
| GRIN |
| Griptonite Games |
| Groove Games |
| GSC Game World |
| GT Interactive |
| Guerrilla Games |
| Guild Software |
| Guppyworks |
| Gust |
| Gusto Games |
| Haemimont Games |
| Haggard Games |
| Harmonix |
| Hasbro Interactive |
| Hazardous Software, Inc. |
| HB Studios |
| HBM |
| Headfirst Productions |
| Headstrong Games |
| Headup Games |
| Heavy Iron Studios |
| Her Interactive |
| Heuristic Park |
| HexaDrive |
| Hidden Path Entertainment |
| High Impact Games |
| High Moon Studios |
| High Voltage Software |
| Hip Interactive |
| History Television |
| Hitmaker |
| Holistic Design |
