The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Hudson Soft (Developer) (3 members)
- Hudson Soft (Publisher) (6 members)
- HumaNature Studios (Developer) (1 member)
- Hunter's Trophy (Series) (4 members)
- Hunting (Genre) (16 members)
- Hydravision Entertainment (Developer) (4 members)
- Hydravision Entertainment (Publisher) (1 member)
- Hyperdimension Neptunia (Series) (3 members)
- I-Friqiya (Developer) (1 member)
- I-Friqiya (Publisher) (1 member)
- IO Interactive (Developer) (5 members)
- ISquared Games (Developer) (1 member)
- ISquared Games (Publisher) (1 member)
- Id Software (Developer) (3 members)
- Idea Factory (Developer) (11 members)
- Idea Factory (Publisher) (5 members)
- Idol Minds (Developer) (3 members)
- Ignition Entertainment (Publisher) (7 members)
- Ignition Tokyo (Developer) (1 member)
- Ilusis Interactive Graphics (Developer) (1 member)