| I-Imagine Interactive | Publisher | |
| I-Space Interactive | Developer | |
| I-cell | DeveloperPublisher | |
| I. Okuyama | Developer | |
| I.E.Game studio | Developer | |
| I.J.E. | Developer | |
| I.Magic | DeveloperPublisher | |
| I.Motion Inc. | Publisher | |
| I.O.S. Team | DeveloperPublisher | |
| I.S.C. | Developer | |
| I.S.C. Co., Ltd. | DeveloperPublisher | |
| I.T.L | Developer | |
| I.T.L Inc. | Developer | |
| I.V.O Games | DeveloperPublisher | |
| I.W.A. | Developer | |
| I3 | Developer | |
| I3uckwheat | Developer | |
| IAA | Developer | |
| IAH Games | Publisher | |
| IAmDirt | Developer | |
| IBA | Developer | |
| IBM | DeveloperPublisher | |
| IBOL | Developer | |
| IBS | DeveloperPublisher | |
| IC Contemporary | Developer | |
| IC Rainbow | Developer | |
| ICE | DeveloperPublisher | |
| ICE Software | Developer | |
| ICE Software (Alan Grier, Chris Scudds) | Developer | |
| ICE Software (Ian Morrison, Alan Laird, Alan Grier, Dave Lowe) | Developer | |
| ICE Software (Ian Morrison, Douglas Little, Alan Grier, Chris Scudds) | Developer | |
| ICE9jpn | Developer | |
| ICMationDev | Developer | |
| ICOM Simulations | DeveloperPublisher | |
| ICON Games | Publisher | |
| ICONICWARE | Developer | |
| ICS | DeveloperPublisher | |
| IChoMo | Developer | |
| ICreateMyGames | Developer | |
| ID Software | Developer | |
| IDC | DeveloperPublisher | |
| IDDK | Developer | |
| IDHAS Studios | Developer | |
| IDSA | Publisher | |
| IDSI | Developer | |
| IE Institute | DeveloperPublisher | |
| IEP_Esy | Developer | |
| IF | Developer | |
| IFCATS | Developer | |
| IGG | Publisher | |