- Samaritan Volunteer Organization
- SANTE GLOBALE DEVELOPMENT INTERGREE TANZANIA
- Sanu English Pre & Primary School
- SAVE LIVES ORGANISATION TRUST FUND
- SAVE OUR ENVIRONMENT TANZANIA
- Scholars Focus Against Social Miseries
- seedoplan
- Sengerema Informal Sector Centre
- SERENGETI ENVIRONMENTAL CONSERVATION AND RELIEF AGENCY
- Shaloom Care House (SCH)