Group
- Interactivities Ink / Nightfall Productions5
- Interactivities Ink, Limited19
- Interformic Games2
- Intergalaxy, Inc.1
- International Brotherhood of Gamers11
- Into The Nexus2
- Into the Nexus8
- Intrepid Games24
- Iocane Productions7
- Iron Brigade Wargamers4
- Iron Crown Enterprises52
- Iron Crown Enterprises Ltd5
- Iron DM "Dreads" Nathan Collins1
- Iron DM All-Stars2
- Iron Dungeon Master All-Stars1
- Iron Dungeon Masters1
- Iron Dungeonmaster2
- Iron GM2
- Iron GM, LLC17
- Iron Kitten Games4