You can help expand this article with text translated from the corresponding article in German. (October 2015) Click [show] for important translation instructions. View a machine-translated version of the German article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:Erich Otto Volkmann]]; see its history for attribution. You may also add the template {{Translated|de|Erich Otto Volkmann}} to the talk page. For more guidance, see Wikipedia:Translation.

Erich Otto Volkmann (November 23, 1879, Freistadt – December 1938, Potsdam) was a German military career officer, archivist and author of military writings during the Weimar Republic and the Nazi period.

Volkmann began his military career in 1898. In 1900 he became an officer and was appointed as a General Staff officer at the beginning of the First World War. After the war, from 1919 he joined the border service at the East Prussian Volunteer Corps in East Prussia. He retired as a major in 1920 and then joined archival council at the Reich Archives in Potsdam. In 1935 he was promoted to the Upper Archival Council (Oberregierungsrat) there.

He is noted for his research into German morale in the last days of the First World War, and reproduced evidence of mass disaffection from the German Army.^[1] He was sympathetic to the army, and aimed to diffuse criticisms by people hostile to the military.^[2]