The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Pastiche (6 members)
- Patricia Smith (1 member)
- Paul di Filippo (1 member)
- Pentacon 1.8/50 (14 members)
- Pentax 67 (78 members)
- People and person infobox templates (1 member)
- Percy Bysshe Shelley (3 members)
- Permalink (64 members)
- Personal (7 members)
- Peter F. Hamilton (2 members)
- Peter Gabriel (9 members)
- Peter Watts (2 members)
- Pets (18 members)
- Phil Collins (1 member)
- Philip K. Dick (1 member)
- Philip Larkin (1 member)
- Philip Sidney (1 member)
- Philosophy (2 members)
- Photography (115 members)
- Pi (22 members)
- Placebo (3 members)
- Placeholder templates (1 member)
- Plato (1 member)
- Poetry (53 members)
- Policies (12 members)
- Politics (408 members)
- Portfolio (104 members)
- Portraits (85 members)
- Positioning templates (1 member)
- Posthuman Blasphemy (0 members)
- Posthuman Figuration (2 members)
- Presentations (8 members)
- Prewriting (FAQ) (6 members)
- Primers (2 members)
- Professional (63 members)
- Programming typing-aid templates (2 members)
- Project Mailer (24 members)
- Projects (14 members)
- Prompts (3 members)
- Proposals (2 members)
- Prose (4 members)
- Pyotr Ilyich Tchaikovsky (1 member)
- Quinon 1.9/55 (14 members)
- Quiz (FAQ) (1 member)
- Quotation mark templates (2 members)
- Quotation templates (1 member)
- REO Speedwagen (1 member)
- RIP (17 members)
- RM2 (4 members)
- Rahe Family (25 members)