Siegfried Lorenz (born 26 November 1930) is a former senior party functionary of the ruling Socialist Unity Party of Germany (SED / Sozialistische Einheitspartei Deutschlands) in East Germany. He was a member of the Politbüro of The Party's Central Committee in Berlin and First Secretary of the party's Karl-Marx-Stadt regional leadership team. During his career held a number of positions with the country's FDJ (Free German Youth movement).