Reich Ministry for the Occupied Eastern Territories

The Reich Ministry for the Occupied Eastern Territories (RMfdbO; German: Reichsministerium für die besetzten Ostgebiete), commonly known as the Ostministerium, (pronounced [ˈɔstminɪsˌteːʁiʊm] ^ⓘ; "Eastern Ministry") was a ministry of Nazi Germany responsible for occupied territories in the Baltic states and Soviet Union from 1941 to 1945. Alfred Rosenberg served as Reichsminister with Alfred Meyer as his deputy during its existence.

The Ostministerium was created by Adolf Hitler shortly after the German invasion of the Soviet Union to control the vast areas captured and projected for capture by the Wehrmacht in the Baltic states, Belarus, Ukraine, and Russia. Two Reichskommissariats were established: Ostland and Ukraine, while two more were planned, Moskowien and Kaukasien, but the Wehrmacht never established firm possession of the areas designated and German civilian control never developed there. The Ostministerium was involved in the development and implementation of Generalplan Ost, which fell under its jurisdiction, along with the Reich Commission for the Consolidation of German Nationhood, the Reich Security Main Office, and the SS Race and Settlement Main Office. It was one of the main agencies that oversaw the Holocaust in the Soviet Union.