Thyssen may refer to:
- The Thyssen family, which has many notable members including:
- Friedrich Thyssen
- August Thyssen
- Fritz Thyssen
- Bodo Thyssen
- Heinrich, Baron Thyssen-Bornemisza de Kászon
- Baron Hans Heinrich Thyssen-Bornemisza.
- Thyssen AG, steel company founded by August Thyssen, with successors and subsidiaries including:
- ThyssenKrupp, one of the world's largest steel producers, formed by merger of the Thyssen and Krupp steel companies
- ThyssenKrupp Marine Systems
- Thyssen-Bornemisza Museum