The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Otariinae (0 members)
- PD ineligible (1 member)
- PD license tags (1 member)
- PD shape (1 member)
- Page TOC templates (1 member)
- Pages using "Collapse" template without content (1 member)
- Pages using the JsonConfig extension (86 members)
- Pages with TemplateStyles errors (1 member)
- Pages with broken file links (19 members)
- Pages with incorrect biology template usage (7 members)
- Pages with incorrect template usage (1 member)
- Pages with invalid language codes (1 member)
- Pages with script errors (12 members)
- Phenomena (1 member)
- Philosophical concepts by field (1 member)
- Pinnipedia (0 members)
- Pinnipediformes (1 member)
- Placentalia (1 member)
- Plant-based food (1 member)
- PlayStation 3 games by name (1 member)
- PlayStation 4 games by name (2 members)
- PlayStation Vita games by name (1 member)
- PowerPC game consoles (1 member)
- Primary license tags (flat list) (2 members)
- Processes (1 member)
- Products by name (1 member)
- Proprietary emulation software (1 member)
- Puzzle video games (1 member)
- Roblox (1 member)
- SI base quantities (1 member)
- SVG created with ... templates (1 member)
- SVG historical pirate flags (1 member)
- SVG icons by theme (2 members)
- Scalar physical quantities (1 member)
- Seashells (1 member)
- Sega Dreamcast (0 members)
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- Sixth-generation video game consoles (2 members)
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- Spacetime (1 member)
- Spiralia (1 member)
- String manipulation templates (1 member)
- Subtemplates (6 members)