The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Wood (149 members)
- Wood working (6 members)
- Woodland and forest (1 member)
- Work exchange (2 members)
- Working animals (5 members)
- Workshop (15 members)
- World Shelters (10 members)
- Yorkshire and the Humber (7 members)
- Yorkshire and the Humber files (4 members)
- Yorkshire and the Humber images (0 members)
- Young and beginning farmers (2 members)
- Z-Plasty (26 members)
- Z-plasty (7 members)
- Zambia (6 members)
- Zane Middle School (57 members)
- Zef upcycling (6 members)
- Zero-point energy (4 members)
- Zero Hunger (1 member)
- Zero waste (4 members)
- 한국어 (2 members)