Sahaviriya Steel Industries PCL or simply SSI (Thai: 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.

Following a period of difficult trading conditions the parent company was granted an application to wind up its UK business on 2 October 2015.

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