- Scholars Focus Against Social Miseries
- seedoplan
- Sengerema Informal Sector Centre
- SERVICE HEALTH AND DEVELOPMENT FOR PEOPLE LIVING POSITIVELY WITH HIV/AIDS
- Service to widows, orphans and the little ones organization
- Shirikisho la Vyama vya watu wenye ulemavu Tanzania-(SHIVYAWATA)-Mkoa wa Morogoro
- SOCIAL AND ECONOMIC DEVELOPMENT INITIATIVES OF TANZANIA
- Social Vision Group Tanzania (SOVIGOTA)
- Society Empowerment Agency
- Society for Service to Rural Development in Tanzania