Karl Ritter (5 June 1883, Dörflas, Marktredwitz – 31 July 1968, Murnau am Staffelsee) was a German diplomat during the Third Reich and was convicted as a war criminal in the Ministries Trial. A member of the Nazi Party, he was ambassador to Brazil for two years, Special Envoy to the Munich Agreement, and a senior official in the Foreign Office during World War II.