The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Index of seas (1 member)
- Index of ships (6 members)
- Infobox templates (4 members)
- Internal link templates (11 members)
- Irish politicians (1 member)
- John Redmond (2 members)
- Licence templates (4 members)
- Link templates (2 members)
- Locations on the Western Front (4 members)
- Main page templates (13 members)
- Maintenance (4 members)
- Maintenance templates (2 members)
- Military awards and decorations (1 member)
- Military museums (1 member)
- Military organisation (1 member)
- Military units and formations (5 members)
- Ministry of Information First World War Official Collection (4 members)
- Monarchs of the Great War (1 member)
- Mortars (2 members)
- Mortars of the United Kingdom (1 member)
- Navigation templates (5 members)
- Navplate templates (2 members)
- No image templates (1 member)
- Note templates (3 members)
- On this day templates (3 members)
- PD-UK files (91 members)
- Page navigation template (2 members)
- Pages requiring cleanup (0 members)
- Pages using duplicate arguments in template calls (0 members)
- Pages with TemplateStyles errors (157 members)
- Pages with broken file links (16 members)
- Pages with notes (8 members)
- Photographs by British soldiers (2 members)
- Photographs by John Warwick Brooke (1 member)
- Photographs by Thomas Keith Aitken (1 member)
- Photographs of the Great War (3 members)
- Politicians (1 member)
- Politicians by country (2 members)
- Poppy fields (1 member)
- Postcards of the Great War (0 members)
- Posters of the Great War (0 members)
- Pre-formatted title sizes (4 members)
- Progress icon templates (3 members)
- Project - Speeches of the Great War (7 members)
- Public domain UK (5 members)
- Public domain in the United Kingdom (14 members)
- Public domain in the United States (14 members)
- Publications (5 members)
- Publishers by country (1 member)
- Publishers of the United Kingdom (4 members)