- Solomon Gebre-Selassie
- Solomon Ramonyai
- Solomon Vincent
- SOLWADI (Solidarity with Women in Distress)
- Somali Speaking Centre of International PEN (SS PEN)
- Sonia Fayman
- Sonia Maria
- Sonia Mariza
- Sonia Rossetti
- Sonny Onyegbula
- Sonwabiso Ngcowa
- Sophie Anmuth
- Sophie Ngugi
- Sophie Ngugi, Vedran Vojinovic, Chambi Chachage, Anne Amadi, Awuor Ponge
- Soren Ambrose
- Sory I. Konaté
- SOS Habitat
- SOS Habitat - Ação Solidária
- SOS Habitat - Rafael Moraes
- Souad Abdennebi-Abderrahim
- Souleymane Bassoum
- Souleymane Dembélé
- Souleymane Guengueng
- Soumaila Ismaël Traoré
- Soumaila T. Diarra
- Soumitra Ghosh
- Soumya Dutta
- South Africa Adult Educators Union (SAAEU)-Western Cape Region.
- South African Communist Party
- South African Council of Churches