The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Abilities (81 members)
- Actors (917 members)
- Actors portraying Alec Abrams (2 members)
- Actors portraying Brainiac (5 members)
- Actors portraying Chloe Sullivan (4 members)
- Actors portraying Clark Kent (8 members)
- Actors portraying Conner Kent (3 members)
- Actors portraying Davis Bloome (3 members)
- Actors portraying Dawn Stiles (8 members)
- Actors portraying Emily Dinsmore (2 members)
- Actors portraying Jason Teague (2 members)
- Actors portraying Jimmy Olsen (2 members)
- Actors portraying Jor-El (4 members)
- Actors portraying Lana Lang (4 members)
- Actors portraying Lex Luthor (7 members)
- Actors portraying Lionel Luthor (2 members)
- Actors portraying Moira Sullivan (2 members)
- Actors portraying Oliver Queen (3 members)
- Actors portraying Patricia Swann (2 members)
- Actors portraying Siobhan McDougal (4 members)
- Actors portraying Tess Mercer (2 members)
- Actors portraying Tina Greer (8 members)
- Actors portraying Zod (3 members)
- Actors portraying an unknown character (14 members)
- Actors portraying multiple characters (139 members)
- Actors with comic book roles outside of Smallville (28 members)
- African-Americans (138 members)
- Aliens (60 members)
- Allusions (10 members)
- Almeracian technology (1 member)
- Alternate universe characters (27 members)
- American characters (1,288 members)
- Animated images (16 members)
- Apokoliptan Artifacts and Symbols (3 members)
- Appearances templates (21 members)
- Aquaman characters (6 members)
- Aquaman crew (4 members)
- Arrowverse actors (280 members)
- Arrowverse crew (5 members)
- Article message templates (12 members)
- Articles (16 members)
- Articles containing spoiler information (2 members)
- Articles needing citations (121 members)
- Articles needing cleanup (16 members)
- Articles needing pictures (38 members)
- Articles that are works-in-progress (6 members)
- Articles that need to moved into past tense (1 member)
- Articles to be merged (2 members)
- Articles under consideration for deletion (2 members)
- Articles with open questions on the talk page (0 members)