The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Islands (1 member)
- Knights (1 member)
- Knuckles' Chaotix (2 members)
- Knuckles (TV series) (1 member)
- Knuckles Clan (1 member)
- Knuckles the Echidna (3 members)
- Line-handling templates (1 member)
- Link modules (1 member)
- List formatting and function templates (3 members)
- Lists of games (1 member)
- Lizards (1 member)
- Lua-based templates (28 members)
- Lua metamodules (1 member)
- Lua templates with errors (2 members)
- Main page templates (1 member)
- Males (14 members)
- Mario & Sonic at the London 2012 Olympic Games (1 member)
- Mario & Sonic at the Olympic Games (2 members)
- Mario & Sonic at the Olympic Games Tokyo 2020 (2 members)
- Mario & Sonic at the Olympic Winter Games (2 members)
- Mario & Sonic at the Rio 2016 Olympic Games (2 members)
- Material from Wikipedia (7 members)
- Mathematical formatting templates (1 member)
- Mbox and messagebox templates (2 members)
- Merge templates (1 member)
- Metal Fighters (1 member)
- Microsoft platforms (5 members)
- Miles "Tails" Prower (3 members)
- Mobile games (9 members)
- Module documentation pages (16 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 (17 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)