The Generalplan Ost (German pronunciation: [ɡenəˈʁaːlˌplaːn ˈɔst]; English: Master Plan for the East), abbreviated GPO, was Nazi Germany's plan for 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.

The program's operational guidelines were based on the policy of Lebensraum proposed by Adolf Hitler and the Nazi Party in fulfilment of the Drang nach Osten (drive to the East) ideology of German expansionism. As such, it was intended to be a part of the New Order in Europe. Approximately 3.3 million Soviet POWs captured by the Wehrmacht were killed as part of the GPO. The plan intended for the genocide of the majority of Slavic inhabitants by various means – mass killings, forced starvations, slave labour and other occupation policies. The remaining populations were to be forcibly deported beyond the Urals, paving the way for German settlers.

The plan was a work in progress. There are four known versions of it, developed as time went on. After the invasion of Poland, the original blueprint for Generalplan Ost was discussed by the RKFDV in mid-1940 during the Nazi–Soviet population transfers. The second known version of the GPO was procured by the RSHA from Erhard Wetzel [de] in April 1942. The third version was officially dated June 1942. The final version of the Master Plan for the East came from the RKFDV on October 29, 1942. However, after the German defeat at Stalingrad, resources allocated to colonization policies were diverted to Axis war efforts, and the program was gradually abandoned.

Generalplan Ost was Nazi Germany's plan for the colonization and Germanization of Central and Eastern Europe over a period of twenty-five years. Implementing it would have necessitated genocide and ethnic cleansing on a vast scale to be undertaken in the Eastern European territories occupied by Germany during World War II. It would have included the extermination and de-population of most Slavic people in Eastern Europe.

The plan, prepared in the years 1939–1942, was part of Adolf Hitler's and the Nazi movement's Lebensraum policy and a fulfilment of the Drang nach Osten (English: Drive towards the East) ideology of German expansion to the east, both of them part of the larger plan to establish the New Order. More than economic calculations, ideological fanaticism and racism played a central role in Nazi regime's implementation of extermination programs such as the GPO. Hitler's doctrine of Lebensraum envisaged the mass-killings, enslavement and ethnic cleansing of Slavic inhabitants of Eastern Europe, followed by the colonization of these lands with Germanic settlers.

Although racist views against Slavs had precedent in German society before Hitler's rule, Nazi anti-Slavism was also based on the doctrines of scientific racism. The "Master Race" doctrine of Nazi ideology condemned Slavs to permanent domination by Germanic peoples, since it viewed them as primitive people who lacked the ability to undertake autonomous activities. Generalplan Ost evolved from these racist, imperialist ideas and was formulated by the Nazi regime as its official policy during the course of the Second World War.

The body responsible for the Generalplan Ost was the SS's Reich Security Main Office (RSHA) under Heinrich Himmler, which commissioned the work. The document was revised several times between June 1941 and spring 1942 as the war in the east progressed successfully. It was a confidential proposal whose content was known only to those at the top level of the Nazi hierarchy; it was circulated by RSHA to the Reich Ministry for the Occupied Eastern Territories (Ostministerium) in early 1942.

Between 1940 and 1943, Himmler supervised the drafting of at least five variants of Generalplan Ost. Four of these drafts were produced by the office of Reich Commissioner for the Consolidation of German Nationhood (RKFDV) and one draft was produced by the RSHA. SS Race and Settlement Main Office and Ostministerium were also involved in the formulating the GPO plans. According to testimony of SS-Standartenführer Hans Ehlich (one of the witnesses before the Subsequent Nuremberg Trials), the original version of the plan was drafted in 1940. As a high official in the RSHA, Ehlich was the man responsible for the drafting of Generalplan Ost along with Konrad Meyer, Chief of the Planning Office of Himmler's RFKDV. It had been preceded by the Ostforschung.

The preliminary versions were discussed by Heinrich Himmler and his most trusted colleagues even before the outbreak of war. This was mentioned by SS-Obergruppenführer Erich von dem Bach-Zelewski during his evidence as a prosecution witness in the trial of officials of the SS Race and Settlement Main Office (RuSHA). According to Bach-Zelewski, Himmler stated openly: "It is a question of existence, thus it will be a racial struggle of pitiless severity, in the course of which 20 to 30 million Slavs and Jews will perish through military actions and crises of food supply." A fundamental change in the plan was introduced on June 24, 1941 – two days after the start of Operation Barbarossa – when the 'solution' to the Jewish question ceased to be part of that particular framework gaining a lethal, autonomous priority.

The planning had included implementation cost estimates, which ranged from 40 to 67 billion Reichsmarks, the latter figure being close to Germany's entire GDP for 1941. A cost estimate of 45.7 billion Reichsmarks was included in the spring 1942 version of the plan, in which more than half the expenditure was to be allocated to land remediation, agricultural development, and transport infrastructure. This aspect of the funding was to be provided directly from state sources and the remainder, for urban and industrial development projects, was to be raised on commercial terms.

The main objective of Generalplan Ost was to establish a pure "German and Aryan" community in Eastern Europe, composed of individuals who would be loyal subjects of the Greater Germanic Reich. Full implementation of the Generalplan Ost aimed at the forced deportations of hundreds of millions of Eastern European natives beyond the Urals and in the slaughter of more than 60 million Slavs, Romanis and Jews. The extermination programme also involved the policy known as the "Hunger Plan", which would have killed more than 30 million Slavic natives in forced starvations.

GPO also envisaged the forced expulsion of around 80 million Russians beyond the Urals, with Nazi planners estimating the deaths of approximately 30 million Russians in the ensuing death marches.

Ethnic group / Nationality targeted	Percentage of ethnic group to be removed by Nazi Germany from future settlement areas
Russians	70–80 million
Estonians	almost 50%
Latvians	50%
Czechs	50%
Ukrainians	65% to be deported from Western Ukraine, 35% to be Germanized
Belarusians	75%
Poles	20 million, or 80–85%
Lithuanians	85%
Latgalians	100%

Widely varying policies were envisioned by the creators of Generalplan Ost, and some of them were actually implemented by Germany in regards to the different Slavic territories and ethnic groups. For example, by August–September 1939 (Operation Tannenberg followed by the A-B Aktion in 1940), Einsatzgruppen death squads and concentration camps had been employed to deal with the Polish elite, while the small number of Czech intelligentsia were allowed to emigrate overseas. Parts of Poland were annexed by Germany early in the war (leaving aside the rump German-controlled General Government and the areas previously annexed by the Soviet Union), while the other territories were officially occupied by or allied to Germany (for example, the Slovak part of Czechoslovakia became a theoretically independent puppet state, while the ethnic-Czech parts of the Czech lands (so excluding the Sudetenland) became a "protectorate"). The plan was partially attempted during the war, resulting indirectly and directly in millions of deaths of ethnic Slavs by starvation, disease, or extermination through labor. The majority of Germany's 12 million forced laborers were abducted from Eastern Europe, mostly in the Soviet territories and Poland.

The final version of the Generalplan Ost proposal was divided into two parts; the "Small Plan" (Kleine Planung), which covered actions carried out in the course of the war; and the "Big Plan" (Grosse Planung), which described steps to be taken gradually over a period of 25 to 30 years after the war was won. Both plans entailed the policy of ethnic cleansing. As of June 1941, the policy envisaged the deportation of 31 million Slavs to Siberia. 75% of Belorussians were regarded unfit for "Germanization" and targeted for extermination or expulsion.

The Generalplan Ost proposal offered various percentages of the conquered or colonized people who were targeted for removal and physical destruction; the net effect of which would be to ensure that the conquered territories would become German. In ten years' time, the plan effectively called for the extermination, expulsion, Germanization or enslavement of most or all East and West Slavs living behind the front lines of East-Central Europe. The "Small Plan" was to be put into practice as the Germans conquered the areas to the east of their pre-war borders. After the war, under the "Big Plan", more people in Eastern Europe were to be affected.

In their place, settlements of up to 10 million Germans were planned to be established in an extended "living space" (Lebensraum), as part of the GPO plan. GPO envisaged the establishment of settlements and "village complexes", each capable of hosting around 300-400 Germanic settlers. Because the number of Germans appeared to be insufficient to populate the vast territories of Central and Eastern Europe, the peoples which the Nazi theorists regarded as being capable of Germanisation and as racially intermediate between the Germans and the Russians (Mittelschicht), namely, Latvians and even Czechs, were also considered to be resettled there. Several Nazi scientists, many of whom were members of the SS, were involved in the planning of GPO. The programme delineated various settler-colonial policies to be undertaken by Nazi Germany in Eastern Europe over a period of 25 years; such as the establishment of new settlements, demographic engineering, construction of new centres, etc., after the planned liquidation of the native populations.

As early as the initial phase of Operation Barbarossa, when Wehrmacht was advancing deep inside Soviet territories while facing little or no local insurrections, Adolf Hitler had contemplated the utility of anti-insurgency campaigns in advancing his Lebensraum program:

a partisans’ war also has its advantage; it enables us to eradicate what is against us.

— Adolf Hitler, "Aktenvermerk vom 16. Juli 1941 über eine Besprechung Hitlers mit Rosenberg, Lammers, Keitel und Göring",

While various Wehrmacht commanders wanted to portray Germans as "liberators" of Eastern Europe and incite anti-communist dissidents to foment a pro-Axis partisan warfare against Soviet Union, Nazi ruling elites sought outright suppression of what they regarded as Slavic "untermenschen". Hardliners like Himmler were averse to initiating agreements with Slavic natives. Hitler was strongly opposed to the entry of Slavic volunteers into the German army and issued orders to disarm the natives. The initial assessment of Hitler and Wehrmacht generals was that Operation Barbarossa could be completed within months without any outside support. During a speech in 16 July 1941, Hitler proclaimed:

"No one but the Germans should ever be allowed to bear arms ... Only a German should bear arms: not a Slav, a Czech, a Cossack or a Ukrainian."

German implementation of Nazi racial principles, combined with the severity of the war in the Eastern Front, resulted in German-occupation forces inflicting brutal measures during its anti-insurgency campaigns. The Schutzstaffel military apparatus, packed with militants ideologically indoctrinated to view Slavs as subhumans, fanatically implemented "Herrenvolk vs. Untermensch" racist criteria in their dealings with natives. Military leadership issued orders to inflict collective punishment against native inhabitants. However, as Axis advances gave way to a war of attrition and as German losses mounted, some Wehrmacht officers began proposing collaborationist policies with the natives, with the purpose of advancing German economic and geo-strategic interests. Even as deteriorating conditions in the front brought around a change in military strategy, speeches of various Wehrmacht generals continued to explicitly and implicitly designate German fighters as "the last bulwark of European civilisation against Slav hordes".

Exploiting anti-semitic sentiments which had persisted since the Tsarist period in occupied territories, collaborationism was also incited amongst the native inhabitants to assist Nazi Germany in implementing the Holocaust. The collaborationist bodies were viewed with suspicion due to the hardline anti-Slavic policy of German occupiers, and their Nazi sponsors largely used these groups as cannon fodder for German war efforts. As a consequence of the ideological constraints of National Socialism and Wehrmacht's rising casualties across the Eastern Front, German units faced shortages of personnel in carrying out the "Final Solution". As anti-fascist partisan warfare intensified across the German-occupied territories of Eastern Europe, Poland, and Yugoslavia, Hitler stated on 6 August 1942: “We shall absorb or eject a ridiculous hundred million Slavs. Whoever talks about caring for them should at once be put into a concentration camp”.

According to Nazi intentions, attempts at Germanization were to be undertaken only in the case of those foreign nationals in Central and Eastern Europe who could be considered a desirable element for the future Reich from the point of view of its racial theories. The plan stipulated that there were to be different methods of treating particular nations and even particular groups within them. Attempts were even made to establish the basic criteria to be used in determining whether a given group lent itself to Germanization. These criteria were to be applied more liberally in the case of nations whose racial material (rassische Substanz) and level of cultural development made them more suitable than others for Germanization. The plan considered that there were a large number of such elements among the Baltic states. Erhard Wetzel felt that thought should be given to a possible Germanization of the whole of the Estonian nation and a sizable proportion of the Latvians. On the other hand, the Lithuanians seemed less desirable since "they contained too great an admixture of Slav blood." Himmler's view was that "almost the whole of the Lithuanian nation would have to be deported to the East". Himmler is described as having had a positive attitude towards Germanising the populations of border areas of Slovenia (Upper Carniola and Southern Styria) and Bohemia-Moravia, but not Lithuania, claiming its population to be of "inferior race".

Himmler's notorious policies included the weaponization of schooling system in occupied territories to Germanize kids and indoctrinate them with Nazi doctrines. Special institutes for children in occupied territories were operated to separate kids who were categorised by Nazi authorities as "racially suitable" from the local inhabitants, wherein they were indoctrinated to be transferred to families in Germany. Despite the obstruction of German war efforts by the colonization policies and scorched earth tactics unleashed against native populations, Himmler dogmatically pursued the implementation of GPO programme and proposed the further expansion of Konrad Meyer's plan. GPO policies hindered the German military from efficiently exploiting the resources from occupied territories during 1942, a decisive phase of the war during which Axis forces had the capability to potentially win in the Eastern Front, before the Red Army could amass more strength.

After the German defeat at the Battle of Stalingrad and other Axis setbacks in the Eastern Front, Nazi planners were forced to practically abandon the extermination campaigns of the GPO by mid-1943. From spring 1943, SS adopted the "Vernichtung durch Arbeit" (trans: "Extermination through labour") policy, which focused on exploiting natives in occupied territories as forced labor to aid German economy and military industry. By late 1943, millions of captives were employed in slave labour camps across German-occupied territories.

Between 1941 and 1945, Nazi Germany launched forced starvations and advanced a "war of annihilation" (Vernichtungskrieg) in the Eastern Front to implement the Generalplan Ost. The Wehrmacht implemented scorched-earth tactics throughout the region and forcibly expelled natives en masse to the east. Nazi officials then charted out buffer zones intended to serve as future Nordic settlements. Hunger Plan was Nazi Germany's strategy to forcibly starve around 31 to 45 million Eastern Europeans by capturing food stocks and redirecting them to German forces.

Nazi Germany conducted its warfare in the Eastern Front as a colonialist campaign of plunder and slaughter, involving the unhinged looting of resources and wholesale terrorism against native populations. German occupation policies in Eastern Europe were characterized by genocide through "war of annihilation", and were ideologically driven by the Nazi racist doctrines and settler-colonial policy of Lebensraum.

Lithuania, Latvia and Estonia were to be deprived of their statehood, while their territories were to be included in the area of German settlement. This meant that Latvia and especially Lithuania would be covered by the deportation plans, though in a somewhat milder form than the expulsion of Slavs to western Siberia. While the Estonians would be spared repressions and physical liquidation (that the Jews and the Poles were experiencing), in the long term the Nazi planners did not foresee their existence as independent entities and they would ultimately be deported as well, with eventual denationalisation; initial designs were for Latvia, Lithuania and Estonia to be Germanised within 25 years; Heinrich Himmler revised them to 20 years.

Despite German opposition to their attempts of state-formation, Baltic natives were classified as "superior" to Slavs in the Nazi racial hierarchy. Therefore, German authorities implemented a deeper scale of collaborationist policy in the Baltic society. Nazi collaborationists amongst the Latvian, Lithuanian and Estonian natives were given senior posts in the administrative bodies of the German occupation. In German-occupied Lithuania, a civilian administration which controlled its internal security was tolerated. This semi-autonomous entity existed within the Reichskommissariat Ostland. Such concessions were non-existent in Poland, Ukraine and Belarussia, where the Germanic occupation policy was characterised by full-blown colonization, exploitation of resources, state-terrorism and forcing natives into slave labour.

RSHA's GPO program had categorised 75% of Belarussians as "Eindeutschungsunfähig" (trans: "ineligible for Germanization"); targeting them for ethnic cleansing or violent eradication. After forcibly expelling or exterminating an estimated 5-6 millions of its native inhabitants, these lands were then supposed to be handed over to Germanic settlers for implementing the Lebensraum agenda. Child indoctrination institutions which hosted numerous Belarussian children forcibly were also opened, wherein kids categorised as "racially suitable" were prepared to be transferred to Germany. The first of these centres in Belarus was set up in Bobruysk.

Nazi anti-insurgency warfare conducted across occupied Eastern Europe was also used as an opportunity by German authorities to advance the objectives of GPO and Lebensraum settler-colonial agenda. In Belarussia, divisions of Wehrmacht and SS committed numerous massacres and unleashed state-terror indiscriminately against the native populations, in operations labelled "anti-partisan undertakings".

In 1941, the German leadership decided to destroy the Polish nation completely, and in 15–20 years the Polish state under German occupation was to be fully cleared of any ethnic Poles and settled by German colonists. A majority of them, now deprived of their leaders and most of their intelligentsia (through mass murder, destruction of culture, banning education above the absolutely basic level, and kidnapping of children for Germanization), would have to be deported to regions in the East and scattered over as wide an area of Western Siberia as possible. According to the plan, this would result in their assimilation by the local populations, which would cause the Poles to vanish as a nation.

Approximately two million ethnic Poles were subjected to a forced Germanization campaign as part of the GPO. According to the plan, by 1952 only about 3–4 million 'non-Germanized' Poles (all of them peasants) were to be left residing in the former Poland. Those of them who would still not Germanize were to be forbidden to marry, the existing ban on any medical help to Poles in Germany would be extended, and eventually Poles would cease to exist. Experiments in mass sterilization in concentration camps may also have been intended for use on the populations. The Wehrbauer, or soldier-peasants, would be settled in a fortified line to prevent civilization reanimating beyond the Ural Mountains and threatening Germany. "Tough peasant races" would serve as a bulwark against attack – however, it was not very far east of the "frontier" that the westernmost reaches within continental Asia of the Nazi Germany's major Axis partner, Imperial Japan's own Greater East Asia Co-Prosperity Sphere would have existed, had a complete defeat of the Soviet Union occurred.

Hitler envisioned the war in Eastern Europe as a campaign of annihilation, intending to culminate it with the decimation of the Russian state, its cities, and symbols of Russian culture in the event of a Nazi victory. On 21 July 1940, Hitler ordered German army commander-in-chief Walther von Brauchitsch to prepare a war-plan to eliminate what he described as the "Russian problem". In a meeting before Wehrmacht military commanders on 31 July 1940, Hitler announced his "final decision" to "finish off" Russia through the initiation of a large military invasion in the spring of 1941.

During Operation Barbarossa, German soldiers ruthlessly perpetrated mass-slaughter of Russian captives as part of the GPO. Out of the 3.2 million Soviet prisoners captured by German forces by December 1941, approximately 2 million had been killed by February 1942, mostly through forced starvation, death marches and mass shootings.

As part of the implementation of the Generalplan Ost, the Nazi regime intended to organize the rounding up of approximately 80 million Russians and expel them beyond the Urals. Nazi bureaucrats estimated that nearly 30 million Russians would have died during the planned death marches to regions beyond the Urals, such as Siberia.

Between 1941 and 1945, approximately three million Ukrainians and other non-Jews were mass-murdered as part of Nazi extermination policies implemented across the regions of Ukraine. In addition, between 850,000–1,600,000 Jews were killed by Nazi forces in Ukraine during this period, with the assistance of local collaborators.

Original Nazi plans advocated the extermination of 65 percent of 23.2 million Ukrainians, with the survivors treated as chattel slaves. Over 2,300,000 Ukrainians were deported to Germany and forced into Nazi slave labor.

Nazi seizure of food supplies in Ukraine just like Soviets did in 1932-33 brought about starvation, as it was intended to do to depopulate that region for German settlement. Soldiers were told to steel their hearts against starving women and children, because every bit of food given to them was stolen from the German people, endangering their nourishment.

After conquering Yugoslavia in April 1941, Nazi Germany partitioned the country and installed puppet dictatorships in Serbia and Croatia. Many of the Yugoslavian territories were annexed by Germany, Italy, Hungary and Bulgaria. Despite the vast population of Slavs in Yugoslavia, Nazi Germany mainly focused on targeting the nation's Jewish and Roma population.

Nearly all the wartime documentation on Generalplan Ost was deliberately destroyed shortly before Germany's defeat in May 1945, and the full proposal has never been found, though several documents refer to it or supplement it. Nonetheless, most of the plan's essential elements have been reconstructed from related memos, abstracts and other documents. Following the war, two out of the three primary records associated with the Generalplan Ost were lost. These included the document drafted by Konrad Meyer; in addition to an investigative report of RSHA's 3rd office.

A major document which enabled historians to accurately reconstruct the Generalplan Ost was a memorandum released on April 27, 1943, by Erhard Wetzel [de], director of the NSDAP Office of Racial Policy, entitled "Opinion and thoughts on the master plan for the East of the Reichsführer SS". Wetzel's memorandum was a broad elaboration of the Generalplan Ost proposal. It came to light only in 1957. Wetzel's report has enabled attempts to re-construct the document on GPO prepared by RSHA's 3rd office.

The extermination document for the Slavic people of Eastern Europe did survive the war and was quoted by Yale historian Timothy Snyder in 2010. It shows that ethnic Poles, Ukrainians and Czechs were primary targets of Generalplan Ost. Belorussians were also a major target. According to the book "Kalkulierte Morde" ("Calculated massacres") published by Swiss historian Hans Christian Gerlach in 1999, Nazi Germany sought to exterminate the entire urban populace (approximately 2 million) and half the rural population (nearly 4.3 million) of Belorussia alone, through mass-starvations. These estimates were calculated by citing the notes of an anonymous author, whom Gerlach postulates to be Waldemar von Poletika, an agricultural scientist at Berlin University.

One of the indictment charges at the trial of Adolf Eichmann, the S.S. officer responsible for the transportation aspects of the Final Solution, was that he was responsible for the deportation of 500,000 Poles. Eichmann was convicted on all 15 counts. Poland's Supreme National Tribunal stated that "the wholesale extermination was first directed at Jews and also at Poles and had all the characteristics of genocide in the biological meaning of this term."

Nazi savagery against Soviet prisoners of war, which resulted in the deaths of approximately 3.3 million captured Soviet detainees, was denounced by the Nuremberg tribunal as a "crime against humanity". According to historian Norman Naimark:

"If the awful counterfactual of a Nazi victory had come to pass, not just Soviet soldiers, but Russians, Belarusians and Ukrainians would surely have shared the fate of the Poles and been eliminated culturally and ethnically as distinct peoples and nations. Genocidal actions against those peoples would have been completed."

— The Cambridge World History of Genocide, Volume 3 (2023),

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