- Sengerema Informal Sector Centre
- SERENGETI ENVIRONMENTAL CONSERVATION AND RELIEF AGENCY
- Service Health and Development for People Living Positively with HIV/AIDS
- SERVICE HEALTH AND DEVELOPMENT FOR PEOPLE LIVING POSITIVELY WITH HIV/AIDS
- Service to widows, orphans and the little ones organization
- Shaloom Care House (SCH)
- SHANGWE COUNSELING CENTRE
- SHDEPHA+ KAHAMA
- SHINYANGA FOUNDATIONFUND
- SHIRIKA LA KUPAMBANA NA MARADHI YA VVU/UKIMWI KIBAHA