| Sahaviriya Steel Industries | |
| Foundation: | 1990 |
| Key People: | Wit Viriyaprapaikit, Chief Executive Officer & President |
| Products: | Steel, hot-rolled steel sheet |
| Revenue: | $1.8 billion USD (2014)[1] |
| Assets: | $2.1 billion USD (2014) |
| Equity: | $131 million USD (2014) |
| Subsid: | SSI UK |
Sahaviriya Steel Industries PCL or simply SSI (th|บริษัท สหวิริยาสตีลอินดัสตรี จำกัด (มหาชน)) is a Thai multinational steel-making company headquartered in Bangkok, Thailand. It was the largest steel sheet producer in Southeast Asia with annual capacity of 4 million tonnes of hot rolled coil, and the largest steel company in Thailand.
Sahaviriya Steel Industries has manufacturing operations in Thailand.
See main article: Teesside Steelworks. Following a period of difficult trading conditions the parent company was granted an application to wind up its UK business on 2 October 2015.[2]