- Wazo Pevu Organization
- West bown
- Wete Environmental Conservation Club (WECOC)
- WIDOWS AND ORPHANED DEVELOPMENT ORGANIZATION
- WINGS ENVIRONMENT AND EDUCATION TRANSFOMATION UNITY
- WIRWANA ASSOCIATION FOR EMPOWERMENT AND DEVELOPMENTS (WAENDELEE)
- WOMAN AND CHILD VISION
- WOMEN AND CHILD DEVELOPMENT INITIATIVE
- WOMEN ENVIRONMENT CONSERVATION ASSOCIATION
- World Wide Opportunities on Organic Farms (WWOOF Tanzania)