| Acronym | Definition |
|---|
| SIES | Strategic Industries and Economic Security |
| SIES | Symposium on Industrial Embedded Systems |
| SIES | South Indian Education Society (educational institution; est. 1932; Mumbai, India) |
| SIES | Startup, Innovation and Entrepreneurship Strategy (online community) |
| SIES | Student Income and Expenditure Survey (Department for Education and Skills; UK) |
| SIES | Office of Strategic Industries & Economic Security |
| SIES | Sindicato de Trabajadores de Industrias Elíctricas de El Salvador (Spanish: Electrical Industry Union of El Salvador) |