The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Assessment (2 members)
- AtoM (2 members)
- Attention to process (2 members)
- AuDA (3 members)
- Audio (3 members)
- Auditing (1 member)
- Category:2016 (0 members)
- Australian Computer Society (2 members)
- Authors (2 members)
- Awards (2 members)
- BBC (3 members)
- Backing up (3 members)
- Backpacks (1 member)
- Backups (7 members)
- Bags (3 members)
- Bannister Street (1 member)
- Barbecues (2 members)
- Batch files (1 member)
- Bc base convert (1 member)
- Beaconsfield (2 members)
- Beards (1 member)
- Beer (5 members)
- Behind the Lines (1 member)
- Ben Kafka (2 members)
- Ben Lee (1 member)
- Ben Yagoda (2 members)
- Bibliography (1 member)
- Bicycle (9 members)
- Bikes (2 members)
- Binding (2 members)
- Blathering (1 member)
- Blog action day (2 members)
- Blog posts (0 members)
- Blogging (20 members)
- Blogs (2 members)
- Category:Blog posts (0 members)
- Boats (2 members)
- Bookbinding (4 members)
- Bookkeeping plugin (5 members)
- Bookplate (2 members)
- Bookpresses (1 member)
- Books (32 members)
- Books in my collection (0 members)
- Boredom (4 members)
- Boring (1 member)
- Boring posts (2 members)
- Box (3 members)
- Boxes (2 members)
- Brad Pettitt (1 member)
- Brain Bag (2 members)