The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- Freo Farm (1 member)
- Freopedia (1 member)
- Furnishings (1 member)
- Furniture (2 members)
- Future (3 members)
- Future plans (2 members)
- GIS (1 member)
- GITenberg (4 members)
- GLAM (1 member)
- GNU (1 member)
- GPS (1 member)
- Gadgets (3 members)
- Gallery (1 member)
- Gallery3 (1 member)
- Gallery Project (1 member)
- Games (1 member)
- Gardening (11 members)
- Gardens (1 member)
- Gaston Bachelard (1 member)
- Gears (2 members)
- Genealogy (9 members)
- General International Standard Archival Description (1 member)
- Geogeeks (1 member)
- Geometry (2 members)
- George Eliot (1 member)
- George Gissing (1 member)
- George Steiner (1 member)
- Ghost (1 member)
- Git (4 members)
- Github (3 members)
- GluePHP (1 member)
- Glueless (2 members)
- Gmail (2 members)
- God (1 member)
- Grammar (1 member)
- Grand Lane (1 member)