The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Doug Rattmann voice files (1 member)
- Dutch (1 member)
- Easter Eggs (4 members)
- Emoticon images (7 members)
- Europeans (11 members)
- Externally linked files (59 members)
- Extracted media (362 members)
- FAL images (4 members)
- Fact Core players (7 members)
- Fact Core voice files/es (99 members)
- Fact core voice files (99 members)
- Fact core voice files/de (99 members)
- Fact core voice files/es (0 members)
- Fact core voice files/fr (99 members)
- Fact core voice files/ru (100 members)
- Fair use images (203 members)
- Featured article candidates (4 members)
- Featured articles (8 members)
- Featured articles/lang (17 members)
- Finns (4 members)
- Flag icons (54 members)
- Flag images (1 member)
- Formatting templates (47 members)
- GFDL images (1 member)
- GLaDOS images (15 members)
- GLaDOS voice files (1,811 members)
- GLaDOS voice files/de (1,041 members)
- GLaDOS voice files/es (1,430 members)
- GLaDOS voice files/fr (1,355 members)
- GLaDOS voice files/ru (1,847 members)
- GPL images (8 members)
- GUI (1 member)
- GUI/fi (1 member)
- GUI/fr (1 member)
- GUI/pt-br (1 member)
- GUI/ru (1 member)
- GUI images (7 members)
- GUI images/pt-br (1 member)
- GUI images/ru (3 members)
- Gameplay (7 members)
- Gameplay/cs (1 member)
- Gameplay/da (2 members)
- Gameplay/de (3 members)
- Gameplay/es (4 members)
- Gameplay/fi (5 members)
- Gameplay/fr (5 members)
- Gameplay/hu (1 member)
- Gameplay/ja (1 member)
- Gameplay/ko (3 members)
- Gameplay/no (1 member)