The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Oversomnia Locations (60 members)
- Oversomnia Nexus Worlds (7 members)
- Oversomnia Screenshots (30 members)
- PGray (17 members)
- Pages using DynamicPageList3 dplvar parser function (1 member)
- Pages using DynamicPageList3 parser function (201 members)
- Pages using HTML (19 members)
- Pages using duplicate arguments in template calls (1 member)
- Pages with broken file links (230 members)
- Pages with ignored display titles (4 members)
- Pages with script errors (21 members)
- Pages with too many expensive parser function calls (0 members)
- Parallax Background (9 members)
- Paravex (1 member)
- Pinu (21 members)
- Playable Characters (21 members)
- Preload (4 members)
- Property setting templates (3 members)
- Proton (5 members)
- QMark (16 members)
- Qs0UrDFJ (39 members)
- Quote templates (2 members)
- Qxy (243 members)
- RIMA (1 member)
- RM824 Somnium (3 members)
- ROKU95 (109 members)
- Raggi (1 member)
- Raptarr8 (1 member)
- Reading help (1 member)
- Reas (3 members)
- Removed Content (122 members)
- River (7 members)
- Rollaby (4 members)
- Roninnozlo (7 members)
- Ronto (8 members)
- Roverkibb (3 members)
- Ruri (24 members)
- Rurima (15 members)
- Río (130 members)
- SMW output templates (4 members)
- Sabamiso (11 members)
- Saiiko2 (2 members)
- Sakiyuki's Worlds (11 members)
- Screenshots (270 members)
- Shakzass (2 members)
- She Awaits (5 members)
- She Awaits Characters (2 members)
- She Awaits Guides (5 members)
- She Awaits In Development (1 member)
- She Awaits Locations (23 members)