The National Socialist German Workers' Party, (German: Nationalsozialistische Deutsche Arbeiterpartei (help·info), abbreviated NSDAP), commonly known in English as the Nazi Party, was a political party in Germany between 1919 and 1945. It was known as the German Workers' Party (DAP) before the name was changed in 1920.

The party's last leader, Adolf Hitler, was appointed Chancellor of Germany by president Paul von Hindenburg in 1933. Hitler rapidly established a totalitarian regime known as the Third Reich.

Nazi ideology stressed the failure of democracy, failure of Laissez-faire capitalism, "racial purity of the German people" and persecuted those it perceived either as race enemies or Lebensunwertes Leben, that is "life unworthy of living". This included Jews, Slavs, and Roma along with German homosexuals, the mentally disabled, communists, and others. To carry out these beliefs, the party and the German state which it controlled organized the systematic murder of approximately six million Jews (in what has become known as the Holocaust), and about five million other people, mainly Russians, Poles and Roma. Many thousands of political enemies of the Nazi regime, along with German gays, people with disabilities, and religious minorities were also killed. Hitler's desire to build an empire in Europe through expansionist policies was a major influence that led to the outbreak of World War II in Europe.