| InvertMouse | Developer | |
| Inverted Games | Developer | |
| Inverted Hedgehog | Developer | |
| InvertedEarthTheory | Developer | |
| InvertedHuman | Developer | |
| Invex | DeveloperPublisher | |
| Invi Image | Publisher | |
| Invictus Games | DeveloperPublisher | |
| Invictus Games, Ltd. | Developer | |
| Invictus[citation needed] | Developer | |
| Invincible Cat | Developer | |
| Invincidude | Developer | |
| Invisible Collective | Publisher | |
| Invisible but Real Locomotive | Developer | |
| Involgamus | Developer | |
| Inzombi | Developer | |
| Iodine | Developer | |
| Iodine Dynamics | Developer | |
| Ioennir | Developer | |
| Iombra | Developer | |
| Ion Lands | Developer | |
| Ion Storm | Developer | |
| Ioncorupterx | Developer | |
| Ionescu Andrei | Developer | |
| Ionis Software International (Roger Danison) | Developer | |
| Iora Rua | Developer | |
| IoriBranford | Developer | |
| Iosys | DeveloperPublisher | |
| Iperurania Arts | Developer | |
| Iplayli | Developer | |
| Ippokratis | Developer | |
| Iramontes | Developer | |
| IratusLord | Developer | |
| Irem | DeveloperPublisher | |
| Irem (JP) | Publisher | |
| Irem (JP/EU) | Publisher | |
| Irem Corp. | Developer | |
| Irem JP/NA | Publisher | |
| Irem Software Engineering | DeveloperPublisher | |
| IremAS,JP,KO | Publisher | |
| IremJP | Publisher | |
| IremJP,KO | Publisher | |
| Irenburg | Developer | |
| Irene Lara | Developer | |
| Irgendwen | Developer | |
| Iridescent Industries | Developer | |
| Iridon | Developer | |
| Iridon Interactive AB | Developer | |
| Iris Dream | Developer | |
| Iris Idokogi | Developer | |