The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- LSD (28 members)
- Lakes (1 member)
- Led (2 members)
- Lemniscate (25 members)
- Light (27 members)
- Location templates (7 members)
- Locations (3,364 members)
- Locations with Wake-Up Events (3 members)
- Luok (5 members)
- Lysenthe (2 members)
- MadameMimic (8 members)
- Madotsuki images (95 members)
- Maengo (1 member)
- Maintenance (15 members)
- Makitsuki's Worlds (23 members)
- Manga images (80 members)
- Maple (37 members)
- Maps (51 members)
- Maptsuki (92 members)
- MartiN0304 (1 member)
- Marty281 (3 members)
- Mayapon (12 members)
- MedicineMan1920 (1 member)
- Meena (1 member)
- Messier (5 members)
- Mikan Muzou (3 members)
- Mikan Muzou Characters (1 member)
- Mikan Muzou Guides (4 members)
- Mikan Muzou Locations (55 members)
- Mikan Muzou Nexus Worlds (6 members)
- Mike (17 members)
- Milica (1 member)
- MillieAmp (20 members)
- Minichibis (2 members)
- Misc Images (212 members)
- Missing Author (1 member)
- Missing BGM (469 members)
- Missing BGM author (0 members)
- Missing Location (9 members)
- Missing Map ID (15 members)
- Missing Role (9 members)
- Missing Version Added (756 members)
- Missing infobox image (62 members)
- Missing speed (5 members)
- Mitzyrie (10 members)
- Mizkura (3 members)
- Moerani (1 member)
- Mokaccino (10 members)
- Mooncaller (1 member)
- Moriwo (66 members)