The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Space Station Designs (10 members)
- Space Stations (25 members)
- Space Vessel (1 member)
- Space Vessel Designs (69 members)
- Space Vessels (104 members)
- Special Abilities (7 members)
- Spells (7 members)
- Star Systems (57 members)
- Star Wars (0 members)
- Starfleet (4 members)
- Starfleet Characters (3 members)
- Starfleet Non-Player Characters (4 members)
- Starfleet Vessels and Facilities (9 members)
- Stub message templates (1 member)
- Stubs (58 members)
- Subtemplates of WPBannerMeta (1 member)
- Sumutlis Sector (5 members)
- Super Powers (0 members)
- Swiss writer navigational boxes (1 member)
- Søren Kierkegaard (1 member)
- Talk Pages (76 members)
- Talk header templates (1 member)
- Talk message boxes (3 members)
- Talk namespace templates (1 member)
- Tau Majestius Sector (7 members)
- Technology (3 members)
- Template documentation (15 members)
- Template documentation pages (13 members)
- Template shell templates (1 member)
- Templates (4 members)
- Templates including undated clean-up tags (1 member)
- Templates needing documentation (5 members)
- Templates needing substitution checking (7 members)
- Templates that are not mobile friendly (1 member)
- Templates used by AutoWikiBrowser (1 member)
- Templates using TemplateData (6 members)
- Templates with TemplateData errors (2 members)
- Terran Sector (HSD) (1 member)
- Terrestrial Anomalies (2 members)
- Terrestrial Facilities (17 members)
- Terrestrial Vessel Designs (15 members)
- Terrestrial Vessels (3 members)
- The Lost Ones (4 members)
- Thumper (2 members)
- Thumper's images (12 members)
- Time Travel (6 members)
- Top icon protection templates (1 member)
- Transwiki guide (2 members)
- Treaties (7 members)
- Typing-aid templates (1 member)