The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Sonic the Hedgehog: The Movie (2 members)
- Sonic the Hedgehog (16-bit) staff (3 members)
- Sonic the Hedgehog (1991) (6 members)
- Sonic the Hedgehog (1991) alternate versions and ports (1 member)
- Sonic the Hedgehog (2006) (8 members)
- Sonic the Hedgehog (2013) (1 member)
- Sonic the Hedgehog (8-bit) (5 members)
- Sonic the Hedgehog (Didj) (2 members)
- Sonic the Hedgehog (TV series) (1 member)
- Sonic the Hedgehog (film series) (2 members)
- Sonic the Hedgehog (film series) character galleries (1 member)
- Sonic the Hedgehog (film series) groups (1 member)
- Sonic the Hedgehog (film series) staff (1 member)
- Sonic the Hedgehog (movie series) (2 members)
- Sonic the Hedgehog (movie series) groups (1 member)
- Sonic the Hedgehog 10th Anniversary (1 member)
- Sonic the Hedgehog 15th Anniversary (2 members)
- Sonic the Hedgehog 20th Anniversary (3 members)
- Sonic the Hedgehog 2 (16-bit) (9 members)
- Sonic the Hedgehog 2 (8-bit) (5 members)
- Sonic the Hedgehog 3 (1 member)
- Sonic the Hedgehog 3 (movie) (1 member)
- Sonic the Hedgehog 4 (6 members)
- Sonic the Hedgehog 4: Episode I (4 members)
- Sonic the Hedgehog 4: Episode II (5 members)
- Sonic the Hedgehog CD (6 members)
- Sonic the Hedgehog CD (2011) (1 member)
- Sonic the Hedgehog Level Creator (3 members)
- Sonic the Hedgehog Pocket Adventure (7 members)
- Sonic the Hedgehog Triple Trouble (8 members)
- Sony platforms (6 members)
- Sorting templates (1 member)
- Space Colony ARK (1 member)
- Space stations (3 members)
- Spacecraft (1 member)
- Species (1 member)
- Speed types (9 members)
- Spin-offs (21 members)
- Sports games (4 members)
- Steam games (18 members)
- Stubs (1 member)
- Super Smash Bros. Brawl (6 members)
- Super Smash Bros. Ultimate (5 members)
- Super Smash Bros. for Nintendo 3DS and Wii U (4 members)
- Super forms (2 members)
- Table templates (1 member)
- Tails' creations (1 member)
- TailsTube (1 member)
- TailsTube episodes (2 members)
- Tails Adventure (4 members)