The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Alpha (75 members)
- Alpha images (105 members)
- Animated images (8 members)
- Ash Twin Project Members (17 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (0 members)
- Characters (127 members)
- Citation needed (0 members)
- Cleanup (0 members)
- Community (5 members)
- Concept art (4 members)
- Copyright templates (12 members)
- Creatures (4 members)
- Disambiguations (0 members)
- Documentation templates (3 members)
- Echoes of the Eye (16 members)
- Formatting templates (24 members)
- Gameplay (15 members)
- Guides (0 members)
- Hearthians (67 members)
- Hidden categories (0 members)
- Images (581 members)
- Images needing improvement (0 members)
- Infobox templates (6 members)
- Legal notices (3 members)
- Locations (41 members)
- Locations in the Dark Bramble (21 members)
- Locations on Brittle Hollow (22 members)
- Locations on Giant's Deep (29 members)
- Locations on Timber Hearth (45 members)
- Locations on the Attlerock (5 members)
- Locations on the Hourglass Twins (28 members)
- Locations on the Quantum Moon (11 members)
- Locations on the Stranger (7 members)
- Logos (11 members)
- Media (2 members)
- Moons (4 members)
- Navigation templates (4 members)
- Nomai (60 members)
- Notice templates (13 members)
- Outer Wilds (18 members)
- Outer Wilds Ventures Members (9 members)
- Outer Wilds Wiki (9 members)
- Pages to be merged (1 member)
- Pages to be moved (0 members)
- Pages with broken file links (0 members)
- Person (2 members)
- Phenomena (2 members)
- Planets (23 members)
- Promotional images (14 members)