| Abbreviation | Definition |
|---|---|
| SADTU | South African Democratic Teachers' Union |
| SAFPU | South African Football Players Union |
| SAFU | South African Flower Union |
| SALR | Shenk Alumni Lab Reunion |
| SAMWU | South Africans Municipal Workers Union |
| SANU | Sudan African National Union |
| SANWU | South African National Workers Union |
| SAPU | South African Polic Union |
| SAPU | South African Policing Union |
| SAPU | South African Poling Union |
| SAQU | South African Quran Union |
| SARU | South African Rugby Union |
| SASU | Sociology and Anthropology Student Union |
| SATAWU | South Africa Transport and Allied Workers Union |
| SATAWU | South African Transport Allied Workers Union |
| SATAWU | South African Transport and Allied Workers Union |
| SATU | South African Typographical Union |
| SAZILAT | Sadeeq And Zainab International Love Always Together |
| SBCU | South Bay Credit UnionSouth Bay Credit Union |
| SC | Social Club |