The German Peace Society (German: Deutsche Friedensgesellschaft (DFG)) was founded in 1892 in Berlin. In 1900 it moved its headquarters to Stuttgart. It still exists and is known as the Deutsche Friedensgesellschaft - Vereinigte KriegsdienstgegnerInnen (DFG-VK; German Peace Society - United War Resisters).
Persons associated with it historically include Nobel Peace Prize winners Alfred Hermann Fried and Bertha von Suttner, as well as Ludwig Quidde and Carl von Ossietzky. Suppressed by the Nazis, it was refounded in November 1945.
References
German Peace Society Wikipedia(Text) CC BY-SA