| Gravity |
| Gray Matter Studios |
| GreenScreen Interactive Software |
| Greenwave |
| GRIN |
| Grip Games |
| Griptonite Games |
| Groove Games |
| Grounding Inc. |
| GSC Game World |
| GT Interactive |
| Guerrilla Cambridge |
| Guerrilla Games |
| Guild Software |
| Guppyworks |
| Gust |
| Gusto Games |
| Haemimont Games |
| Haggard Games |
| HAL Laboratory |
| Hammerfall Publishing |
| Harebrained Schemes |
| 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 |
| Hiker Games |
| Hip Interactive |
| History Television |
| Hitmaker |
| Holistic Design |
| Honeyslug |
| HotGen |
| Hothead Games |
| Hothouse Creations |
| House of Tales |
| Housemarque |
| Hudson Soft |
| Human Head Studios |
| HumaNature Studios |
| Humble Hearts |
| Hydravision |
| Hypnotix |
| I-Imagine Interactive |
| Ice-Pick Lodge |
| Iceberg Interactive |
| id Software |
| Idea Factory |
