The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Patches with no source/ru (16 members)
- Patches with no source/zh-hans (8 members)
- Pictogram images (13 members)
- Pings in Portal 2 (1 member)
- Placeholders (1 member)
- Poles (6 members)
- Portal (14 members)
- Portal/cs (5 members)
- Portal/da (2 members)
- Portal/de (1 member)
- Portal/es (5 members)
- Portal/fi (7 members)
- Portal/fr (7 members)
- Portal/ja (2 members)
- Portal/ko (3 members)
- Portal/pl (5 members)
- Portal/pt-br (6 members)
- Portal/ru (8 members)
- Portal/sv (1 member)
- Portal/zh-hans (1 member)
- Portal/zh-hant (2 members)
- Portal: Prelude (2 members)
- Portal: Prelude chambers (46 members)
- Portal: Prelude chambers/fr (46 members)
- Portal: Prelude chambers/pl (1 member)
- Portal: Still Alive (2 members)
- Portal: Still Alive/cs (1 member)
- Portal: Still Alive/es (1 member)
- Portal: Still Alive/fi (1 member)
- Portal: Still Alive/fr (1 member)
- Portal: Still Alive/pl (1 member)
- Portal: Still Alive/pt-br (1 member)
- Portal: Still Alive/ru (1 member)
- Portal: Still Alive/zh-hant (1 member)
- Portal: Still Alive achievements images (9 members)
- Portal: Still Alive chambers (14 members)
- Portal: Still Alive chambers/fr (14 members)
- Portal 1 images (274 members)
- Portal 1 walkthrough (13 members)
- Portal 2 (17 members)
- Portal 2/cs (2 members)
- Portal 2/da (2 members)
- Portal 2/de (1 member)
- Portal 2/es (6 members)
- Portal 2/fi (9 members)
- Portal 2/fr (8 members)
- Portal 2/ja (1 member)
- Portal 2/ko (1 member)
- Portal 2/pl (6 members)
- Portal 2/pt (1 member)