The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Modules subject to page protection (43 members)
- Modules that add a tracking category (7 members)
- Modules that manipulate strings (4 members)
- Modules using tabular data (1 member)
- Multi-column templates (2 members)
- Namespace example pages (2 members)
- Namespace manipulation templates (9 members)
- Navigational boxes (1 member)
- Navigational boxes without horizontal lists (7 members)
- Navigational meta-templates (1 member)
- Notice and warning templates (8 members)
- Pagelinks templates (6 members)
- Pagename manipulation templates (3 members)
- Pages monitored by Wikipedia bots (1 member)
- Pages used in system messages needing protection (40 members)
- Pages using deprecated source tags (4 members)
- Pages using div col with small parameter (3 members)
- Pages using left with no arguments (2 members)
- Pages using right with no input arguments (2 members)
- Pages using sidebar with the child parameter (2 members)
- Pages using xtag template with unsupported tag name (1 member)
- Pages which use a template in place of a magic word (0 members)
- Pages with TemplateStyles errors (7 members)
- Pages with broken file links (3 members)
- Pages with incorrect protection templates (14 members)
- Pages with script errors (151 members)
- Pages with syntax highlighting errors (2 members)
- Pages with templates in the wrong namespace (0 members)
- Parameter handling templates (1 member)
- Parameter selection templates (2 members)
- People (1 member)
- Placeholder templates (1 member)
- Portable Building Infoboxes (32 members)
- Portable Infoboxes (32 members)
- Positioning templates (5 members)
- Printworthy redirects (1 member)
- Produced Materials (2 members)
- Professions (49 members)
- Programming typing-aid templates (15 members)
- Quotation templates (2 members)
- Raw Materials (0 members)
- Raw Resources (5 members)
- Rcat template documentation pages (7 members)
- Redirect templates (11 members)
- Redirects from alternative names (7 members)
- Redirects from merges (5 members)
- Redirects from modifications (4 members)
- Redirects from moves (27 members)
- Redirects from shortcuts (14 members)
- Redirects to redirect templates (4 members)