The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Redirect category template documentation pages (3 members)
- Redirect templates (5 members)
- Redirects from alternative names (2 members)
- Redirects from merges (4 members)
- Redirects from modifications (3 members)
- Redirects from moves (12 members)
- Redirects from shortcuts (9 members)
- Redirects to redirect templates (4 members)
- Resizing templates (2 members)
- Rodents (1 member)
- Science and nature templates parameter issues (1 member)
- Sega Game Gear games (4 members)
- Sega Master System games (2 members)
- Sega Mega Drive games (3 members)
- Sega Saturn games (1 member)
- Sega Streaming Theater Sonic Edition (2 members)
- Sega Superstars Tennis (1 member)
- Sega platform games (1 member)
- Sega platforms (17 members)
- Semantic markup templates (3 members)
- Series (2 members)
- Shadow Generations (4 members)
- Shadow the Hedgehog (1 member)
- Shadow the Hedgehog (game) (4 members)
- Shows (7 members)
- Software table cell templates (2 members)
- Sol Dimension inhabitants (1 member)
- Songbirds (1 member)
- Sonic's transformations (1 member)
- Sonic & All-Stars Racing Transformed (2 members)
- Sonic & Sega All-Stars Racing (2 members)
- Sonic 3D Blast (2 members)
- Sonic 3 & Knuckles (3 members)
- Sonic 3 & Knuckles locations (2 members)
- Sonic Advance (6 members)
- Sonic Advance 2 (5 members)
- Sonic Advance 3 (6 members)
- Sonic Adventure (4 members)
- Sonic Adventure 2 (5 members)
- Sonic Adventure 2: Battle (1 member)
- Sonic Adventure 2 alternate versions and ports (1 member)
- Sonic Adventure DX: Director's Cut (1 member)
- Sonic Adventure locations (1 member)
- Sonic Battle (2 members)
- Sonic Blast (2 members)
- Sonic Boom (TV series) (1 member)
- Sonic Chaos (2 members)
- Sonic Chronicles: The Dark Brotherhood (5 members)
- Sonic Colors: Ultimate (1 member)
- Sonic Colors (Nintendo DS) (5 members)