The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- "Gang" Bege's Oh My Family Chapters (37 members)
- "Gang" Bege's Oh My Family Covers (37 members)
- 4Kids (4 members)
- 4Kids Entertainment DVD Covers (11 members)
- 4Kids Songs (6 members)
- 4Kids Subpages (2 members)
- A Big Fan of One Piece Covers (4 members)
- Abilities (5 members)
- Abilities Navibox Templates (10 members)
- Acceptable Images (18 members)
- Accino Family (7 members)
- Ace's Great Blackbeard Search Chapters (29 members)
- Ace's Great Blackbeard Search Covers (29 members)
- Action Images (1,005 members)
- Active Discussions (17 members)
- Active Projects (3 members)
- Actors (3 members)
- Administration (0 members)
- Admirals (5 members)
- Adventure Characters (3 members)
- Age Age Super Marines (6 members)
- Alabasta Residents (0 members)
- Alabasta Saga Antagonists (0 members)
- Album Covers (118 members)
- Albums (23 members)
- Alchemi Residents (5 members)
- Alliances (6 members)
- Alternative Name Redirects (5,488 members)
- Alubarna Residents (13 members)
- Alvida Pirates (5 members)
- Amazon Lily Arc Chapters (11 members)
- Amazon Lily Arc Episodes (14 members)
- Amber Pirates (2 members)
- Amigasa Village Residents (5 members)
- Amigo Pirates (2 members)
- Ammo (6 members)
- Ancient Zoan (9 members)
- Ancient Zoan Devil Fruit Users (9 members)
- Animal Band (5 members)
- Animal Images (626 members)
- Animal Species (6 members)
- Animal Species Subpages (13 members)
- Animal Theater Covers (129 members)
- Animals (47 members)
- Animals with Devil Fruit Abilities (7 members)
- Animated Gifs (68 members)
- Anime (12 members)
- Anime Comic Covers (19 members)
- Anime Heroes Images (10 members)
- Anime Images (16 members)