The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Externals (1 member)
- F-91W (1 member)
- FAT (1 member)
- FOSS (1 member)
- Facebook (4 members)
- Family (3 members)
- Family history (2 members)
- Fandom (1 member)
- Fanfic (1 member)
- Fantasy (1 member)
- Features (3 members)
- Federal Election 2007 (1 member)
- Feedback (1 member)
- Feeds (3 members)
- Ferries (1 member)
- Fiction (2 members)
- Figo's (1 member)
- Fileinfo (1 member)
- Filenames (1 member)
- Files (5 members)
- Filesystems (2 members)
- Filing (1 member)
- Firefox (2 members)
- Fixing (1 member)
- FlatCats (1 member)
- Flattening (1 member)
- Flickr (3 members)
- Focus (1 member)
- Food (2 members)
- Food Co-op (1 member)
- Food shortages (1 member)
- Foreign keys (1 member)
- Forms (1 member)
- 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 (52 members)
- Fremantle Carnevale (1 member)
- Fremantle City Council (3 members)
- Fremantle Gazette (2 members)
- Fremantle History Society (1 member)
- Fremantle Reform (1 member)
- Fremantle Society (7 members)
- Fremantle Workers' Club (1 member)
- Freo (1 member)
- FreoWiki (2 members)
- Freo Farm (1 member)