The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Air Raider (46 members)
- Air Raider (IfPS) (2 members)
- Aircraft (10 members)
- Allies (18 members)
- Article management templates (4 members)
- Article stubs (22 members)
- Artillery (7 members)
- BlogListingPage (0 members)
- Blog posts (18 members)
- Browse (8 members)
- Candidates for deletion (0 members)
- Candidates for speedy deletion (0 members)
- Category templates (3 members)
- Characters (20 members)
- Classes (29 members)
- Community (6 members)
- Content (2 members)
- Copyright (0 members)
- Disambiguations (5 members)
- EDF 2025 (0 members)
- Earth Defense Force: Insect Armageddon (2 members)
- Earth Defense Force: Iron Rain (24 members)
- Earth Defense Force: World Brothers (1 member)
- Earth Defense Force: World Brothers 2 (1 member)
- Earth Defense Force 2017 (28 members)
- Earth Defense Force 2025 (235 members)
- Earth Defense Force 2: Invaders From Planet Space (24 members)
- Earth Defense Force 4.1: The Shadow of New Despair (241 members)
- Earth Defense Force 4.1: Wing Diver The Shooter (1 member)
- Earth Defense Force 5 (52 members)
- Earth Defense Force 6 (2 members)
- Earth Defense Force Insect Armageddon (43 members)
- Enemies (62 members)
- Fencer (39 members)
- Forums (6 members)
- Game (0 members)
- Gameplay (16 members)
- Games (32 members)
- General wiki templates (31 members)
- Global Defence Force (3 members)
- Global Defense Force (17 members)
- Global Defense Force Tactics (1 member)
- Ground Vehicles (6 members)
- Helicopters (5 members)
- Help (5 members)
- Help desk (3 members)
- Hidden categories (2 members)
- Image wiki templates (9 members)
- Images (54 members)
- Infantry (IfPS) (2 members)