- WAPSAM Community Foundation
- Wasaidizi wa kisheria Masasi
- Washindi Kwenye Mapambano ya UKIMWI
- Water and Environmental Sanitation Projects Maintenance Organization
- Water Relief and Environmental Conservation (WRECO)
- Watoto Network
- Watoto Yatima na Elimu Tanzania (WAYETA)
- Wazo Pevu Organization
- WEMA GROUP
- West bown