Karl Linder (5 April 1900 in Frankfurt am Main – 17 March 1979 in Groß-Bieberau) was a Nazi Party (NSDAP) official who served as Gauleiter of Gau Hesse-Nassau South and Gau Hesse-Nassau as well as in many governmental positions, including as Second Bürgermeister of Frankfurt am Main. A member of the Sturmabteilung (SA), Linder held the rank of SA-Brigadeführer.