a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland (in a portion annexed into Germany in 1939) during World War II and the Holocaust.

Bergen-Belsen, or Belsen, was a Nazi concentration camp in what is today Lower Saxony in northern Germany, southwest of the town of Bergen near Celle.

Buchenwald (literally 'beech forest') was a Nazi concentration camp established on Ettersberg hill near Weimar, Germany, in July 1937.

Majdanek (or Lublin) was a Nazi concentration and extermination camp built and operated by the SS on the outskirts of the city of Lublin during the German occupation of Poland in World War II.

The Kiev-West (in German sources) or Syrets was a Nazi concentration camp or (arbeitserziehungslager – correctional labour camp) established in 1942 in Kyiv's western neighborhood of , part of Kyiv since 1799.

Sachsenhausen or Sachsenhausen-Oranienburg was a German Nazi concentration camp in Oranienburg, Germany, used from 1936 until April 1945, shortly before the defeat of Nazi Germany in May later that year.