- Societe de Mine et de Carriere
- Society Empowerment Agency
- STEMMUCO MALIHAI ENVIRONMENTAL CLUB
- Sunya Ward Education and Training
- Sustainable Community Development Initiatives Association
- Sustainable for Environmental & Climate Change Association (SECCA)
- Taasisi ya Kuzuia Mmonyoko wa Maadili Tanzania
- Tanganyika centre for development and advocacy
- Tanzania Alliance for Biodiversity
- Tanzania Environment and Renewable Energy Group