- Washindi Kwenye Mapambano ya UKIMWI
- Water and Environmental Sanitation Projects Maintenance Organization
- Watoto Network
- Wazo Pevu Organization
- WEMA GROUP
- White Dow
- White Orange Youth
- Widow Women and Orphan Support
- WIDOWS, ORPHANS AND VULNERABLE CHILDREN IN TANZANIA ( WOVUCTA )
- WINGS ENVIRONMENT AND EDUCATION TRANSFOMATION UNITY