The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- MMC24 (30 members)
- MMC25 (142 members)
- Marked For Deletion (61 members)
- Materials (72 members)
- Materials:Filters (12 members)
- Materials:PBS (27 members)
- Materials:Skybox (2 members)
- Materials:Special (4 members)
- Materials:Text (1 member)
- Materials:UI (1 member)
- Materials:UI:Circle Segment (1 member)
- Materials:UI:Text (1 member)
- Materials:Unlit (10 members)
- Materials:Volume (2 members)
- Mbox templates (1 member)
- Media (2 members)
- Meme images (7 members)
- Memes (2 members)
- Metaverse Maker Competition (7 members)
- Modding (2 members)
- Mr (2 members)
- Needs Clip (1 member)
- NodeMenu (0 members)
- Noindexed pages (7 members)
- Obsolete (7 members)
- Official Worlds (6 members)
- Official events (3 members)
- Official icons (2 members)
- Optimization (1 member)
- Pages using duplicate arguments in template calls (1 member)
- Pages with broken file links (473 members)
- Pages with ignored display titles (3 members)
- Pages with script errors (3 members)
- Pages with short description (22 members)
- Pages with syntax highlighting errors (2 members)
- PlaybackStateDriver (0 members)
- Promotional images (1 member)
- ProtoFlux (39 members)
- ProtoFlux:Actions (6 members)
- ProtoFlux:Actions:Indirect (4 members)
- ProtoFlux:All (1,080 members)
- ProtoFlux:Assets (15 members)
- ProtoFlux:Audio (3 members)
- ProtoFlux:Avatar (0 members)
- ProtoFlux:Avatars (10 members)
- ProtoFlux:Avatars:Anchors (7 members)
- ProtoFlux:Avatars:BodyNodes (11 members)
- ProtoFlux:Casts (1 member)
- ProtoFlux:Colors (40 members)
- ProtoFlux:Colors:Channels (52 members)