The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Extensions (4 members)
- Externals (2 members)
- F-91W (2 members)
- FAT (1 member)
- FOSS (2 members)
- Facebook (6 members)
- Family (4 members)
- Family history (3 members)
- Fandom (1 member)
- Fanfic (1 member)
- Fantasy (1 member)
- Features (3 members)
- Federal Election 2007 (2 members)
- Feedback (1 member)
- Feeds (4 members)
- Ferries (1 member)
- Fiction (3 members)
- Figo's (2 members)
- Fileinfo (1 member)
- Filenames (1 member)
- Files (7 members)
- Filesystems (3 members)
- Filing (1 member)
- Firefox (3 members)
- Fixing (2 members)
- FlatCats (1 member)
- Flattening (2 members)
- Flickr (4 members)
- Focus (2 members)
- Food (3 members)
- Food Co-op (1 member)
- Food shortages (1 member)
- Foreign keys (1 member)
- Forms (2 members)
- Forums (1 member)
- Frameworks (1 member)
- Free Culture (2 members)
- Free Software Foundation (1 member)
- Free as in speech (1 member)
- Freedom (3 members)
- Fremantle (57 members)
- Fremantle Carnevale (1 member)
- Fremantle City Council (4 members)
- Fremantle Gazette (2 members)
- Fremantle History Society (1 member)
- Fremantle Reform (2 members)
- Fremantle Society (8 members)
- Fremantle Workers' Club (1 member)
- Freo (1 member)
- FreoWiki (3 members)