Organizations
- Symbiosis School of Economics, an Economics college in India
- School for Social Entrepreneurs, a training institution in the UK
- SSE plc (formerly Scottish and Southern Energy plc), an energy company in the UK and Ireland
- Seed Savers Exchange, a non-profit seed company with heirloom varieties
- Seven Seas Entertainment, a North American publisher of Japanese manga
- Society for Scientific Exploration an organization of scientists and other scholars
- Society for the Study of Evolution, the primary scientific society for the discipline of evolutionary biology
- Southern Star Endemol, an Australian television company
- Stockholm School of Economics, one of Northern Europe's leading business schools
- Stop Stansted Expansion
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