The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Marathon 2: Durandal manual images (4 members)
- Marathon 2: Durandal screenshots (2 members)
- Marathon 2: Durandal sprites (0 members)
- Marathon 2: Durandal terminal images (10 members)
- Marathon ARG (4 members)
- Marathon ARG documents (7 members)
- Marathon ARG images (2 members)
- Marathon Infinity images (4 members)
- Marathon Infinity manual images (0 members)
- Marathon Infinity screenshots (1 member)
- Marathon Infinity sprites (0 members)
- Marathon Infinity terminal images (1 member)
- Marked articles (10 members)
- Marketing documents (0 members)
- Marketing images (1 member)
- Menu screenshots (1 member)
- Menu sprites (0 members)
- Meta categories (40 members)
- Military technology (2 members)
- Navigation templates (9 members)
- New characters (0 members)
- New enemies (0 members)
- New locations (3 members)
- New species (2 members)
- New story (0 members)
- New weapons (0 members)
- Noindexed pages (0 members)
- Non-Marathon images (3 members)
- Non-Marathon renders (1 member)
- Non-Marathon screenshots (2 members)
- Notice templates (8 members)
- Organizations (2 members)
- Pages containing errors (16 members)
- Pages containing omitted template arguments (0 members)
- Pages that use a deprecated format of the chem tags (0 members)
- Pages that use a deprecated format of the math tags (0 members)
- Pages using deprecated enclose attributes (0 members)
- Pages using deprecated source tags (0 members)
- Pages using duplicate arguments in template calls (0 members)
- Pages where expansion depth is exceeded (0 members)
- Pages where node count is exceeded (0 members)
- Pages where template include size is exceeded (0 members)
- Pages where the unstrip depth limit is exceeded (0 members)
- Pages where the unstrip size limit is exceeded (0 members)
- Pages with TemplateStyles errors (0 members)
- Pages with broken file links (2 members)
- Pages with math errors (3 members)
- Pages with math render errors (0 members)
- Pages with non-numeric formatnum arguments (0 members)
- Pages with reference errors (0 members)