- SINGIDA RURAL PEOPLE LIVING WITH HIV/AIDS(SIRUPHA)
- Small Miners Development Initiatives (SMDI)
- Small World Initiatives For Women Security and Children Orphanage (SWIWSCO
- sober tanzania
- Social Awareness and Live Support (SALISU)
- Social and Economic Development Foundation (SEDEF)
- Social Vision Group Tanzania (SOVIGOTA)
- Society Empowerment Agency
- Society for Service to Rural Development in Tanzania
- Society for Women and AIDS in Africa