| SIET | Sai Institute Of Engineering Technology 
| Others |
| SIET | School for International Expedition Training
| Others |
| SIET | Scottish International Education Trust
| Others |
| SIET | Semi-Cryo Integrated Engine Test (Facility)
| Energy, Facility, Test |
| SIET | Shambhunath Institute of Engineering and Technology
| Others |
| SIET | Shridevi Institute of Engineering and Technology
| Others |
| SIET | Singapore Indian Education Trust
| Others |
| SIET | Singapore Institute of Engineering Technologists
| Others |
| SIET | Smart Install Exploitation Tool
| Others |
| SIET | State Institute of Educational Technology
| Others |
| SIET | Sustainable Information Engineering and Technology
| Others |