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- Icar by Rob Lang, a free science-fiction game.
- Imagine Role Playing
- Immortal: The Invisible War, by Ran Valerhon.
- Ironhedge by Empire Wargames
- In Dark Alleys by Vajra Enterprises
- In Nomine - based on In Nomine Satanis / Magna Veritas
- In Nomine Satanis / Magna Veritas (French) by Croc (Siroz) - satiric gang/spy wars involving angels and demons in the contemporary world
- Incursion by Tri Tac Games
- InSaNiTy the role-playing game by Haphazard Projects, uses the in-house DPS System
- InSpectres by Memento Mori Theatricks
- Iron Kingdoms by Privateer Press
- Iron Gauntlets: Heroic Fantasy Roleplaying
- Ironclaw - edited by Sanguine Productions Ltd
- Iron Heroes - d20 system based on making D&D playable without magic
- It Came From The Late, Late, Late Show by Stellar Games
Read more about this topic: List Of Role-playing Games By Name