Generalplan Ost

The Generalplan Ost ( German pronunciation: [ɡenəˈʁaːlˌplaːn ˈɔst]; lit. 'Master Plan for the East'), abbreviated GPO, was Nazi Germany's plan for the settlement and "Germanization" of captured territory in Eastern Europe, involving the genocide, extermination and large-scale ethnic cleansing of Slavs, Eastern European Jews, and other indigenous peoples of Eastern Europe categorized as "Untermenschen" in Nazi ideology. The campaign was a precursor to Nazi Germany's planned colonisation of Central and Eastern Europe by Germanic settlers, and it was carried out through systematic massacres, mass starvations, chattel labour, mass rapes, child abductions, and sexual slavery.

Generalplan Ost was only partially implemented during the war in territories occupied by Germany on the Eastern Front during World War II, resulting indirectly and directly in the deaths of millions by shootings, starvation, disease, extermination through labour, and genocide. However, its full implementation was not considered practicable during major military operations, and never materialised due to Germany's defeat. Under direct orders from Nazi leadership, around 11 million Slavs were killed in systematic violence and state terrorism carried out as part of the GPO. In addition to genocide, millions more were forced into slave labour to serve the German war economy.