Stainless steel is used for a wide range of structural applications in aggressive environments where reliable performance over long periods with little maintenance is required. In addition, stainless steel has an attractive appearance, is strong yet still light, highly ductile and versatile in terms of manufacturing. This Design Manual gives design rules for austenitic, duplex and ferritic stainless steels. The rules are aligned to the 2015 amendment of the Eurocode for structural stainless steel, EN 1993-1-4. They cover the design of cross-sections, members, connections and design at elevated temperatures as well as new design methods which exploit the beneficial strain hardening characteristics of stainless steel. Guidance on grade selection, durability and fabrication is also provided. Fifteen design examples are included which illustrate the application of the design rules.