The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

• Policies‏‎ (9 members)
• Raw assets‏‎ (7 members)
• Real world‏‎ (9 members)
• Redirect templates‏‎ (1 member)
• Renders‏‎ (2 members)
• Root‏‎ (4 members)
• Scenarios‏‎ (0 members)
• Science‏‎ (1 member)
• Screenshots‏‎ (3 members)
• Screenshots by subject‏‎ (4 members)
• Scribunto modules with errors‏‎ (0 members)
• Ships‏‎ (3 members)
• Society and culture‏‎ (1 member)
• Species‏‎ (4 members)
• Species by era‏‎ (2 members)
• Sprites‏‎ (2 members)
• Sprites by subject‏‎ (4 members)
• Star systems‏‎ (1 member)
• Story‏‎ (2 members)
• Stubs‏‎ (15 members)
• Technology‏‎ (4 members)
• TemplateStyles stylesheets with errors‏‎ (0 members)
• Templates‏‎ (26 members)
• Templates with broken file links‏‎ (0 members)
• Terminal images‏‎ (4 members)
• Transportation‏‎ (2 members)
• Trilogy characters‏‎ (9 members)
• Trilogy documents‏‎ (1 member)
• Trilogy enemies‏‎ (3 members)
• Trilogy games‏‎ (3 members)
• Trilogy locations‏‎ (4 members)
• Trilogy species‏‎ (6 members)
• Trilogy story‏‎ (2 members)
• Trilogy weapons‏‎ (9 members)
• URL-linked files‏‎ (0 members)
• URL-linked images‏‎ (0 members)
• Universe and lore‏‎ (7 members)
• Uploaded files‏‎ (3 members)
• Utility templates‏‎ (4 members)
• Vehicle screenshots‏‎ (0 members)
• Vehicle sprites‏‎ (0 members)
• Vehicles‏‎ (2 members)
• Weapon screenshots‏‎ (3 members)
• Weapon sprites‏‎ (1 member)
• Weapons‏‎ (2 members)
• Weapons by era‏‎ (3 members)
• Website images‏‎ (2 members)
• Websites‏‎ (2 members)
• Wiki‏‎ (10 members)
• Wiki images‏‎ (3 members)