The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- In concept (35 members)
- In lore (3 members)
- In production (6 members)
- Inactive (1 member)
- IndVest images (1 member)
- Independent (1 member)
- Independents (1 member)
- Industrial Cutting Tool images (1 member)
- Industrial Services (1 member)
- Industrial Tractor Beam images (2 members)
- Industrial computers (4 members)
- Industrial coolers (12 members)
- Industrial power plants (13 members)
- Industrial quantum drives (8 members)
- Industrial radars (6 members)
- Industrial shield generators (14 members)
- Infobox Templates (27 members)
- Infobox templates (10 members)
- Infobox utility templates (9 members)
- Initiatives (1 member)
- Inmate Worksuit images (1 member)
- Inquisitor images (1 member)
- Inquisitor set (5 members)
- Inspiration Park images (1 member)
- Instructions (2 members)
- Instrument of Surrender (0 members)
- Insurance companies (4 members)
- Interactable (2 members)
- Interface message templates (6 members)
- Intergalactic Aerospace Expo (1 member)
- Intergalactic Aerospace Expo 2949 images (2 members)
- Intergalactic Aerospace Expo 2950 images (144 members)
- Intergalactic Aerospace Expo 2951 images (136 members)
- Intergalactic Aerospace Expo 2952 images (108 members)
- Internal link templates (10 members)
- Interstellar Transport Guild images (1 member)
- Investigation Missions (6 members)
- Invictus Launch Week 2950 images (83 members)
- Invictus Launch Week 2951 images (77 members)
- Invictus Launch Week 2952 images (61 members)
- Invictus Launch Week 2953 images (0 members)
- Invictus Launch Week images (4 members)
- Iron Planet (10 members)
- Ironclad series (1 member)
- Issues (0 members)
- It (0 members)
- It-N (0 members)
- Ita (2 members)
- Ita images (16 members)
- Item (1 member)