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.

On that date he became Deputy Gauleiter to Sprenger who valued Linder's organizational talent, propaganda skills and knowledge of public finances.

[3] When Sprenger moved up to the position of Landesinspekteur on 17 August 1932, Linder succeeded him as Gauleiter of Hesse-Nassau South.

[4] In March 1933, Linder left the Deputy Gauleiter position after he was appointed Second Bürgermeister and head of human resources for the city of Frankfurt under Oberbürgermeister Friedrich Krebs.

From March 1933 to July 1937, Linder served as the editor of the magazine Das Rathaus (The Town Hall).

In January 1935, he was appointed to the Prussian Provincial Council for Hesse-Nassau, serving through the end of the Nazi regime in 1945.

[5] On 1 July 1937, when he relinquished his position as Second Bürgermeister of Frankfurt, Linder was again appointed Deputy Gauleiter of Gau Hesse-Nassau.

In late March 1945, when the American army was invading Hesse-Nassau, Linder opposed the orders to destroy the bridges over the Main River.