This article does not cite any sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Erich Obst" – news · newspapers · books · scholar · JSTOR (December 2009) (Learn how and when to remove this template message)

Karl August Erich Obst (13 September 1886 – 9 June 1981) was a German geographer and geopolitician. Between 1924 and 1944 he was the editor of the German geopolitical magazine "Zeitschrift für Geopolitik".