Institute of National Remembrance in the context of "Stroop Report"

World War II was the deadliest military conflict in history. An estimated total of 70–85 million deaths were caused by the conflict, representing about 3% of the estimated global population of 2.3 billion in 1940. Deaths directly caused by the war (including military and civilian fatalities) are estimated at 50–56 million, with an additional estimated 19–28 million deaths from war-related disease and famine. Civilian deaths totaled 50–55 million. Military deaths from all causes totaled 21–25 million, including deaths in captivity of about 5 million prisoners of war. More than half of the total number of casualties are accounted for by the dead of the Republic of China and of the Soviet Union. The following tables give a detailed country-by-country count of human losses.

Recent historical scholarship has shed new light on the topic of Second World War casualties. Research in Russia since the collapse of the Soviet Union has caused a revision of estimates of Soviet World War II fatalities. According to Russian government figures, USSR losses within postwar borders now stand at 26.6 million, including 8 to 9 million due to famine and disease. In August 2009 the Polish Institute of National Remembrance (IPN) researchers estimated Poland's dead at between 5.6 and 5.8 million. Historian Rüdiger Overmans of the Military History Research Office (Germany) published a study in 2000 estimating the German military dead and missing at 5.3 million, including 900,000 men conscripted from outside of Germany's 1937 borders, in Austria, and in east-central Europe. The Red Army claimed responsibility for the majority of Wehrmacht casualties during World War II. The People's Republic of China puts its war dead at 20 million, while the Japanese government puts its casualties due to the war at 3.1 million. An estimated 7–10 million people died in the Dutch, British, French and US colonies in South and Southeast Asia, mostly from war-related famine.

Oder–Neisse line (German: Oder-Neiße-Grenze, Polish: granica na Odrze i Nysie Łużyckiej) is an unofficial term for the modern border between Germany and Poland. The line generally follows the Oder and Lusatian Neisse rivers, meeting the Baltic Sea in the north. A small portion of Polish territory does fall west of the line, including the cities of Szczecin and Świnoujście (German: Stettin and Swinemünde).

In post-war Poland the government described the Oder–Neisse line as the result of tough negotiations between Polish Communists and Stalin. However, according to the modern Institute of National Remembrance, Polish aspirations had no impact on the outcome; rather the idea of a westward shift of the Polish border was adopted synthetically by Stalin, who was the final arbiter in the matter. Stalin's political goals as well as his desire to foment enmity between Poles and Germans influenced his idea of a swap of western for eastern territory, thus ensuring control over both countries. As with before the war, some fringe groups advocated restoring the old border between Poland and Germany.

The Act on the Institute of National Remembrance – Commission for the Prosecution of Crimes against the Polish Nation (Polish: Ustawy o Instytucie Pamięci Narodowej - Komisji Ścigania Zbrodni przeciwko Narodowi Polskiemu) is a 1998 Polish law that created the Institute of National Remembrance. This memory law was amended twice, in 2007 and 2018.

The 1998 Act's Article 55 criminalized historical negationism of crimes committed against Poles or Polish citizens by Nazi or communist polities; of crimes against peace or humanity; of war crimes; and of political repression—all these being listed in Sections 1 a and 1 b of Article 1. While Holocaust denial was not explicitly mentioned, it is understood to be implicity criminalized.

Karol Tadeusz Nawrocki (born 3 March 1983) is a Polish historian and politician who has served as the 7th president of Poland since 2025. Previously, he served as the director of the Institute of National Remembrance (IPN) from 2021 to 2025, and was the director of the Museum of the Second World War in Gdańsk from 2017 to 2021.

Born in Gdańsk, Nawrocki studied history at the University of Gdańsk, earning a PhD in 2013 with a dissertation on anti-communist activities in the former Polish People's Republic. His academic work centers on themes such as anti-communist resistance, organized crime, and the history of sports, a subject tied to his own background as an active youth athlete, particularly in football and boxing. Nawrocki's early professional career was closely aligned with institutions dedicated to preserving and promoting Poland's historical memory. He joined the Institute of National Remembrance (IPN) in 2009 and gained recognition for reorienting Poland's historical institutions toward a patriotic and anti-communist narrative. In the 2025 presidential election, Nawrocki was chosen as the presidential candidate of the right-wing Law and Justice (PiS) party, ran as a nonpartisan "citizens' candidate" and defeated the liberal Rafał Trzaskowski.

Presidential elections were held in Poland on 18 May 2025. As no candidate received a majority of the vote, a second round was held on 1 June 2025. Incumbent president Andrzej Duda was ineligible for re-election to a third term. The second round was won by conservative Institute of National Remembrance director Karol Nawrocki, with 50.89% of the vote, who was backed by the Law and Justice (PiS) party. Nawrocki defeated the progressive-liberal Mayor of Warsaw, Rafał Trzaskowski, who received 49.11% of the vote, nominated for the second time by the Civic Coalition (KO). It was the third consecutive victory for a candidate supported by Law and Justice in the presidential elections.

In the first round, Trzaskowski narrowly came first with 31.4% of the vote, while the right-wing candidates, Nawrocki, Sławomir Mentzen (Confederation) and Grzegorz Braun (KKP) overperformed polls, winning 29.5%, 14.8% and 6.3% respectively, coming in second, third and fourth. Other candidates of the ruling coalition underperformed and fell below expectations; the centre-right candidate Szymon Hołownia (PL2050) received 4.99% of the vote while the left-wing candidates together secured 10.2%, with coalition candidate Magdalena Biejat (The Left) coming below opposition Adrian Zandberg (Razem).

Crimes against the Polish nation committed by Nazi Germany and Axis collaborationist forces during the invasion of Poland, along with auxiliary battalions during the subsequent occupation of Poland in World War II, included the genocide of millions of Polish people, especially the systematic extermination of Jewish Poles. These mass killings were enacted by the Nazis with further plans that were justified by their racial theories, which regarded Poles and other Slavs, and especially Jews, as racially inferior Untermenschen.

By 1942, the Nazis were implementing their plan to murder every Jew in German-occupied Europe, and had also developed plans to reduce the Polish people through mass murder, ethnic cleansing, enslavement and extermination through labor, and assimilation into German identity of a small minority of Poles deemed "racially valuable". During World War II, the Germans not only murdered millions of Poles, but ethnically cleansed millions more through forced deportation to make room for German settlers (see Generalplan Ost and Lebensraum). These actions claimed the lives of 2.7 to 3 million Polish Jews and 1.8 to 2.77 million ethnic Poles, according to Poland's Institute of National Remembrance. German occupation policies in Poland have been recognized in Europe as a genocide, characterized by extremely large death tolls compared to Nazi atrocities in Western European states.