The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Main page button images (6 members)
- Main page images (9 members)
- Maintenance (45 members)
- Maintenance/es (1 member)
- Maintenance/fi (2 members)
- Maintenance/fr (2 members)
- Maintenance/ja (1 member)
- Maintenance/ko (1 member)
- Maintenance/pl (2 members)
- Maintenance/pt-br (2 members)
- Maintenance/ru (3 members)
- Maintenance templates (43 members)
- Malaysians (1 member)
- Marked for deletion (0 members)
- Mechanics (46 members)
- Mechanics/cs (9 members)
- Mechanics/de (11 members)
- Mechanics/es (21 members)
- Mechanics/fi (35 members)
- Mechanics/fr (33 members)
- Mechanics/hu (1 member)
- Mechanics/ja (4 members)
- Mechanics/ko (15 members)
- Mechanics/nl (1 member)
- Mechanics/no (1 member)
- Mechanics/pl (8 members)
- Mechanics/pt-br (13 members)
- Mechanics/ru (37 members)
- Mechanics/sv (2 members)
- Mechanics/zh-hant (13 members)
- Merchandise (3 members)
- Merchandise images (93 members)
- Misc images (3 members)
- Misc items (21 members)
- Misc items/cs (0 members)
- Misc items/de (2 members)
- Misc items/es (2 members)
- Misc items/fi (21 members)
- Misc items/fr (7 members)
- Misc items/ko (1 member)
- Misc items/pl (13 members)
- Misc items/pt-br (21 members)
- Misc items/ru (21 members)
- Misc items/zh-hans (0 members)
- Misc items/zh-hant (1 member)
- Mod images (1 member)
- Mods (12 members)
- Mods/fr (4 members)
- Mods/pl (0 members)
- Mods/pt-br (4 members)