The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Precognition (0 members)
- Production Companies (2 members)
- Psi (1 member)
- Psychic & Tarot (5 members)
- Psychic Mediums (7 members)
- Psychic Phenomena (9 members)
- Psychic and Tarot (0 members)
- Psychokinesis (1 member)
- Psychology (1 member)
- Puerto Rico (1 member)
- Reported Phenomena (1 member)
- Republic of Ireland (0 members)
- Research (7 members)
- Research Methodology (2 members)
- Research Methods (13 members)
- Research and Resources (1 member)
- Researchers (19 members)
- Rituals (3 members)
- Rotherham (1 member)
- Scientific skepticism (3 members)
- Scotland (2 members)
- Scottish Highlands (1 member)
- Sheffield (5 members)
- Sighting Reports (0 members)
- Skeptical Advocates (9 members)
- Skeptical Organisations (2 members)
- Sleep (1 member)
- Somerset (0 members)
- South Yorkshire (4 members)
- Stage Shows (1 member)
- Stockport (1 member)
- Subject Indexes (4 members)
- Supernatural Fiction (2 members)
- Supernatural fiction (1 member)
- Surrey (1 member)
- Switzerland (0 members)
- TV Personalities (11 members)
- Tarot and Divination (0 members)
- Telepathy (0 members)
- Television (15 members)
- Templates (4 members)
- The Conjuring Universe (2 members)
- The Vault (27 members)
- The Vault Guidelines (18 members)
- The Vault Maintenance (0 members)
- The Vault Profiles (1 member)
- UFO/UAP (6 members)
- UFO Hotspots (2 members)
- UFO Locations (1 member)
- UFO Photographs and Videos (1 member)