| Insanity Interactive | Developer | |
| Insanity Studio | Developer | |
| InsanityVR | Developer | |
| Insanus | Developer | |
| Inscape | Publisher | |
| Insect | Developer | |
| Insecure Shark | Developer | |
| Inside System | DeveloperPublisher | |
| Insight Software | Publisher | |
| Insight_Neutral | Developer | |
| Insomniac Games | DeveloperPublisher | |
| InstCoffee | Developer | |
| Instance Games | Developer | |
| Instant Million | Developer | |
| Instant Software | Publisher | |
| InstantAction | Publisher | |
| Instinct Corporation | Developer | |
| Instinct Design | Developer | |
| Instractor Games | Developer | |
| Insurgency Team | Developer | |
| Insydnis | Developer | |
| IntDev | Developer | |
| Intec | Publisher | |
| Intel11thGen | Developer | |
| Intelek | Developer | |
| IntelliCreations | Developer | |
| IntelliPIX | Developer | |
| Intelligent Chess Software | DeveloperPublisher | |
| Intelligent Design | Developer | |
| Intelligent Design (Malcolm J. Smith) | Developer | |
| Intelligent Design LTD | Publisher | |
| Intelligent Education Software | Developer | |
| Intelligent Games | Developer | |
| Intelligent Statements Inc. | Developer | |
| Intelligent Systems | Developer | |
| Intelligent Systems Nintendo SPD | Developer | |
| Intellivision Productions | DeveloperPublisher | |
| Intense | DeveloperPublisher | |
| Intense! Interactive | Developer | |
| Intentional Educations | Developer | |
| Inter Heart | DeveloperPublisher | |
| Inter State | Developer | |
| InterAction Software | Developer | |
| InterAction Studios | Publisher | |
| InterActive Vision | Developer | |
| InterActive Vision A | Publisher | |
| InterActive Vision Games | Developer | |
| InterChannel | DeveloperPublisher | |
| InterDan | Developer | |
| InterServ | Developer | |