The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Women's health (3 members)
- Wood (170 members)
- Wood working (7 members)
- Woodland and forest (1 member)
- Work exchange (2 members)
- Working animals (4 members)
- Workshop (16 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 (35 members)
- Z-plasty (7 members)
- Zambia (6 members)
- Zane Middle School (57 members)
- Zef upcycling (6 members)
- Zero-point energy (6 members)
- Zero Hunger (1 member)
- Zero waste (5 members)