The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Modules subject to page protection (15 members)
- Modules that add a tracking category (3 members)
- Modules that check for strip markers (1 member)
- Modules tracking Wikidata (1 member)
- Modules using data from Wikidata (1 member)
- Monsters (18 members)
- Mozilla-related templates (1 member)
- Multi-column templates (6 members)
- Music Videos (1 member)
- Music infobox templates (14 members)
- Music templates (1 member)
- Music videos (7 members)
- Musician templates (2 members)
- Namespace manipulation templates (1 member)
- Navboxes using background colours (5 members)
- Navigational box wrapper templates (2 members)
- Navigational boxes (1 member)
- Navigational boxes without horizontal lists (4 members)
- Needs fixing (1 member)
- New Zealand copyright tags (2 members)
- Nocturnal (8 members)
- Noindexed pages (2 members)
- Non-free posters (24 members)
- Non-free use rationale templates (0 members)
- Official website not in Wikidata (1 member)
- Organization infobox templates (1 member)
- Pages used in system messages needing protection (3 members)
- Pages using DynamicPageList3 parser tag (16 members)
- Pages using Tabber parser tag (19 members)
- Pages using div col with small parameter (4 members)
- Pages using duplicate arguments in template calls (2 members)
- Pages using infobox templates with ignored data cells (2 members)
- Pages using track listing with unknown parameters (5 members)
- Pages with YouTube Embeds (0 members)
- Pages with broken file links (602 members)
- Pages with forms (1 member)
- Pages with reference errors (1 member)
- Pages with script errors (755 members)
- Pages with short description (125 members)
- Paralympics task force (1 member)
- People (25 members)
- People and person infobox templates (5 members)
- Polaroids (554 members)
- Positioning templates (1 member)
- Protection templates (1 member)
- Public domain copyright templates (1 member)
- Public domain images (3 members)
- Public domain images ineligible for copyright (shape) (1 member)
- Red, White and Bruised: The Midnight Live (1 member)
- Related-topic templates (1 member)