Bezirk Bialystok (German for District or Region of Białystok, also Belostok), was the new administrative unit of Nazi Germany that existed during the World War II occupation of Poland. It was located to the south-east of East Prussia, in the present-day northeastern Poland as well as in smaller sections of adjacent present-day Belarus and Lithuania. In contrast to most other territories that lay east of the Molotov-Ribbentrop line and which were permanently annexed by the Soviet Union following the Second World War, most of the territory was later returned to Poland.