The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Human characters (2 members)
- Icons (3 members)
- Images (6 members)
- Images by Craig Mullins (2 members)
- Images by Reginald Djour (2 members)
- Images by Robert Mclees (3 members)
- Images by artist (1 member)
- Images by copyright status (1 member)
- Images by source (1 member)
- Images by subject (6 members)
- Images by type (12 members)
- Images of Pfhor characters (1 member)
- Images of characters (7 members)
- Images of human characters (5 members)
- Images of locations (1 member)
- Images of planets (2 members)
- Images of ships (3 members)
- Images of species (3 members)
- Images of technology (2 members)
- Images of vehicles (1 member)
- Images of weapons (6 members)
- Indexed pages (0 members)
- Infobox templates (10 members)
- Locations (2 members)
- Locations by era (2 members)
- Logos (11 members)
- Maintenance (8 members)
- Manual images (3 members)
- Marathon (1994) concept art (1 member)
- Marathon (1994) images (11 members)
- Marathon (1994) manual images (5 members)
- Marathon (1994) screenshots (2 members)
- Marathon (1994) sprites (5 members)
- Marathon (1994) terminal images (3 members)
- Marathon (202X) concept art (1 member)
- Marathon (202X) images (4 members)
- Marathon (202X) renders (6 members)
- Marathon (202X) screenshots (1 member)
- Marathon (reboot) concept art (0 members)
- Marathon (reboot) images (0 members)
- Marathon (reboot) screenshots (0 members)
- Marathon 2: Durandal images (12 members)
- 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 (5 members)