The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Microsoft platforms (5 members)
- Miles "Tails" Prower (3 members)
- Mobile games (9 members)
- Module documentation pages (18 members)
- Module namespace templates (1 member)
- Modules (2 members)
- Modules for general use (2 members)
- Modules for test tools (1 member)
- Modules in beta (1 member)
- Modules subject to page protection (18 members)
- Modules that add a tracking category (5 members)
- Modules that check for strip markers (1 member)
- Modules that manipulate strings (1 member)
- Modules using data from Wikidata (1 member)
- Modules using tabular data (1 member)
- Multi-column templates (1 member)
- Musical characters (2 members)
- Namespace manipulation templates (4 members)
- Navboxes (7 members)
- Navigation templates (1 member)
- Navigational box metatemplates (1 member)
- Ninjas (1 member)
- Nintendo 3DS Virtual Console games (4 members)
- Nintendo 3DS games (2 members)
- Nintendo DS games (6 members)
- Nintendo GameCube games (5 members)
- Nintendo Switch games (9 members)
- Nintendo platforms (7 members)
- Notice and warning templates (2 members)
- Nowiki templates (1 member)
- Numbers as words conversion templates (1 member)
- Other genre games (4 members)
- PC games (9 members)
- PEGI 12 games (3 members)
- PEGI 7 games (12 members)
- Pagename manipulation templates (1 member)
- Pages monitored by Wikipedia bots (1 member)
- Pages used in system messages needing protection (24 members)
- Pages using Lua-based templates (84 members)
- Pages using Tabber parser tag (80 members)
- Pages using multiple image with auto scaled images (1 member)
- Pages with TemplateStyles errors (79 members)
- Pages with broken file links (399 members)
- Pages with reference errors (22 members)
- Pages with script errors (157 members)
- Pages with syntax highlighting errors (117 members)
- Parents (1 member)
- People associated with Sonic the Hedgehog (3 members)
- Planes (1 member)
- Planets (1 member)