The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Antagonists (28 members)
- Anti-heroes (31 members)
- Ants (7 members)
- Apples (4 members)
- Aquatic-themed (5 members)
- Aquatic creatures (3 members)
- Aquatic enemies (2 members)
- Arachnids (18 members)
- Arcade games (18 members)
- Archived request forms (2 members)
- Archives (28 members)
- Article drafts (0 members)
- Article management templates (21 members)
- Article notices (6 members)
- Articles in need of an infobox (844 members)
- Articles in need of cleanup (508 members)
- Articles in need of merge (14 members)
- Articles in need of split (4 members)
- Articles needing more links (2 members)
- Articles with conjunctural names (1 member)
- Articles with dead external links (2 members)
- Articles with plagerized content (0 members)
- Articles with plagiarized content (139 members)
- Articles with stub sections (729 members)
- Articles with wiki icons (1,636 members)
- Artifacts (28 members)
- Artists (9 members)
- Assist Trophy characters (5 members)
- Assistants in Dr. Mario World (1 member)
- Atari consoles (3 members)
- Athletes (1 member)
- Athletic events in Mario and Sonic at the Olympic Games (3 members)
- Attacks (64 members)
- Audio files (14 members)
- Automobiles (3 members)
- Axem Rangers (6 members)
- Babies (18 members)
- Badge images (48 members)
- Badger (1 member)
- Badges (135 members)
- Badges in Mario & Luigi: Bowser's Inside Story (9 members)
- Badges in Mario & Luigi: Partners in Time (17 members)
- Badges in Mario & Luigi: Superstar Saga (18 members)
- Badges in Paper Mario (71 members)
- Badges in Paper Mario: The Thousand-Year Door (88 members)
- Badges in Super Mario Bros. Wonder (12 members)
- Balloons (9 members)
- Balls (3 members)
- Bananas (5 members)
- Bandineros (5 members)