| Illwinter Game Design | Developer | |
| Illymani Designs | Developer | |
| Ilusis Interactive Graphics | DeveloperPublisher | |
| Ilya873 | Developer | |
| Im Fake | Developer | |
| ImDaBanana | Developer | |
| ImDivingDeep | Developer | |
| ImFluffyForLife | Developer | |
| ImMatureTony | Developer | |
| ImPulse Games | Developer | |
| ImTheNorth | Developer | |
| Ima_g0d | Developer | |
| Imadio | Publisher | |
| ImagEngine | Developer | |
| Image & Form | DeveloperPublisher | |
| Image Campus | Developer | |
| Image Epoch | Developer | |
| Image Impressions | Developer | |
| Image Labo | Developer | |
| Image Software | Publisher | |
| Image Space Incorporated | DeveloperPublisher | |
| Image Works | DeveloperPublisher | |
| Image WorksPAL | Publisher | |
| ImageBuilder Software | Developer | |
| Imageepoch | Developer | |
| Images Ltd | Developer | |
| Images Ltd (Damien Stones, James Sharp, Neil Crossley) | Developer | |
| Images Ltd (Dave Semmens, Jim Kinlough, Neil Crossley) | Developer | |
| Images Ltd (Tony Mack, Daren White, Damian Stones, Jason G. Lihou, David Whittaker, Alan Tomkins) | Developer | |
| Images Software | Developer | |
| Imagesoft | Developer | |
| Imagetic Design | Developer | |
| Imageworks | Developer | |
| Imagexcel | Developer | |
| ImagiNovel | Developer | |
| ImagiSoft | DeveloperPublisher | |
| ImagiSoft, Inc. | DeveloperPublisher | |
| Imagic | DeveloperPublisher | |
| ImaginEngine | Developer | |
| Imaginarium | Developer | |
| Imaginarium of Glass & Weeds | Developer | |
| Imaginary Thomas | Developer | |
| Imagination Science | Developer | |
| ImaginationOverflow | Developer | |
| Imaginative Illusions | DeveloperPublisher | |
| Imagine | Publisher | |
| Imagine Fantasia | Developer | |
| Imagine Filmfestival | Developer | |
| Imagine Galaxy | Developer | |
| Imagine Software | DeveloperPublisher | |
| Imagine Software Ltd | Publisher | |
| ImagineGames | Developer | |
| Imagined Reality | Developer | |
| Imagineer | DeveloperPublisher | |
| Imagineer (JP) | Publisher | |
| Imagineer Co., Ltd. | Publisher | |
| Imagineer JP | Publisher | |
| Imagineer and Genki | Publisher | |
| ImagineerJP | Publisher | |
| Imagineering | DeveloperPublisher | |
| Imagineering Inc. | Developer | |
| Imaginengine | Developer | |
| Imagineurfaves | Developer | |
| Imaginia | DeveloperPublisher | |
| Imagisoft | DeveloperPublisher | |
| Imagitec | DeveloperPublisher | |
| Imagitec Design | DeveloperPublisher | |
| Imagitec Design (Chris Wood, Stephen J. Crow, J. Dave Rogers) | Developer | |
| Imagitec Design (David Lyttle, Mick Hanrahan, Gavin Wade, Ben Daglish) | Developer | |
| Imagitec Design (Gavin Wade, Chris Edwards, Barry Leitch) | Developer | |
| Imagitec Design (Mick Hanrahan, Martin Hooley) | Developer | |
| Imagitec Design Limited | Developer | |
| ImakeMemeGames | Developer | |
| Imergy | Developer | |
| Imgn Pro | DeveloperPublisher | |
| Imgn.Pro | DeveloperPublisher | |
| Imira Entertainment | Developer | |
| Imitate Fire | Developer | |
| Immaculate | Developer | |
| Immaterial | Developer | |
| Immaterial Games | Developer | |
| Immersion Games | DeveloperPublisher | |
| Immersion Software | Developer | |
| Immersion Software & Graphics | Developer | |
| Immersive Games | Developer | |
| Immersive Pixels UG | Developer | |
| Immiboy | Developer | |
| Immortal Media Studios | Developer | |
| ImmortalLen | Developer | |
| Immortality Production | DeveloperPublisher | |
| Immy | Developer | |
| Imnotisabelamoner | Developer | |
| ImoutoWarfare | Developer | |
| Impact Games | Developer | |
| Impact Gameworks | DeveloperPublisher | |
| Impact Software (Chris Kerry, Mark Rogers, Steve Kerry, Barry Leitch) | Developer | |
| Impact Software Development | Developer | |
| ImpactGames | DeveloperPublisher | |
| Impbox Games | Developer | |
| Imperative Entertainment | Publisher | |
| Impergatox | Developer | |
| Imperia Studios | Developer | |
| ImperialSwag | Developer | |
| Imperio_Fungo | Developer | |
| Implicit Gaming | Developer | |
| Impmaster | Developer | |
| Important Little Games | Developer | |
| Impossible Worlds | Developer | |
| Impostersyndrome | Developer | |
| Impostor Cat Games | Developer | |
| Impresario | Developer | |
| Impressions | DeveloperPublisher | |
| Impressions Games | DeveloperPublisher | |
| Improx Games | Developer | |
| Impulse Games | DeveloperPublisher | |
| Impulze | Publisher | |
| Imre Kovats | Developer | |
| In Solitudine Pax | Developer | |
| In Utero | Developer | |
| In Vitro Games | DeveloperPublisher | |
| In-D Gaming | DeveloperPublisher | |
| In-Side | DeveloperPublisher | |
| In2Games | DeveloperPublisher | |
| InBreak Studios | Developer | |
| InCiti Games | Developer | |
| InDepth Gaming | Developer | |
| InJoy Motion | Publisher | |
| InLight Entertainment | Developer | |
| InSeed | Developer | |
| InSide Team | Developer | |
| InSpirit_IndieDev | Developer | |
| InTheNighttime | Developer | |
| InXile Entertainment | DeveloperPublisher | |
| InXile EntertainmentNA | Publisher | |
| Ina Joe | Developer | |
| Inacio | Developer | |
| Inane Cat | Developer | |
| Inari Bourguenolle | Developer | |
| Inasa | Developer | |
| Inateno | Developer | |
| Inbit Studios | Developer | |
| Inc4nuS | Developer | |
| Incanus | Developer | |
| Incentive Software | DeveloperPublisher | |
| Incentive Software Tag (Philip Taglione) | Developer | |
| Incinerator Games | Developer | |
| Incinerator Studios | Developer | |
| Incinious | Developer | |
| Incognito Entertainment | Developer | |
| Inconspicuous Creations | DeveloperPublisher | |