The Holocaust (from the Greek ὁλόκαυστος holókaustos: hólos, "whole" and kaustós, "burnt"), also known as the Shoah (Hebrew: השואה, HaShoah, "catastrophe"; Yiddish: חורבן, Churben or Hurban, from the Hebrew for "destruction"), was the genocide of approximately six million European Jews during World War II, a programme of systematic state-sponsored murder by Nazi Germany, led by Adolf Hitler, throughout Nazi-occupied territory. Of the nine million Jews who had resided in Europe before the Holocaust, approximately two-thirds perished. In particular, over one million Jewish children were killed in the Holocaust, as were approximately two million Jewish women and three million Jewish men.

Some scholars maintain that the definition of the Holocaust should also include the Nazis' genocide of millions of people in other groups, including Romani, leftists, Soviet prisoners of war, Polish and Soviet civilians, homosexuals, people with disabilities, Jehovah's Witnesses and other political and religious opponents, which occurred regardless of whether they were of German or non-German ethnic origin. Using this definition, the total number of Holocaust victims is between 11 million and 17 million people.