- Stuart Wilson
- Students Security Committee, Obafemi Awolowo Unniversity Ile-Ife
- Suba Churchill
- Subhankar Banerjee
- Sudan Democracy First Group
- Sudan Solidarity Network
- Sudanese civil society networks
- Sudanese Group for Democracy and Elections and the Sudanese Network for Democratic Elections
- SUDO (UK)
- SUDO UK
- SUDO(UK)
- Sue Adams
- Sue Valentine
- Suely Aldir Masseder
- Sukant Chandan
- Sukuma Kenya
- Suleyman Garaba Konte
- Sundiata Keita Cha-Jua & Augustus Wood
- Sundiata Xian Tellem
- Sungu Oyoo
- Suraj Kumar
- Suren Pillay
- Süreyya Yiğit
- Survie
- Survival International
- Susan Burgess-Lent
- Susan de Oliveira
- Susan George, Jean-Marie Harribey, Gustave Massiah, Chico Whitaker
- Susan Gingell
- Susan Hawthorne