Denazification (German: Entnazifizierung) was an Allied initiative to rid German and Austrian society, culture, press, economy, judiciary, and politics of any remnants of the National Socialist ideology. It was carried out specifically by removing those involved from positions of influence and by disbanding or rendering impotent the organizations associated with it. The program of denazification was launched after the end of the Second World War and was solidified by the Potsdam Agreement.

Denazification in Germany was attempted through a series of directives issued by the Allied Control Council, seated in Berlin, beginning in January 1946. "Denazification directives" identified specific people and groups and outlined judicial procedures and guidelines for handling them. Though all the occupying forces had agreed on the initiative, the methods used for denazification and the intensity with which they were applied differed between the occupation zones.

Denazification also refers to the removal of the physical symbols of the Nazi regime. For example, in 1957 the German government re-issued World War II Iron Cross medals without the swastika in the center.

Heinrich Luitpold Himmler (pronounced [ˈhaɪnʁɪç ˈluˑɪtˌpɔlt ˈhɪmlɐ] ( listen) 7 October 1900 – 23 May 1945) was Reichsführer of the Schutzstaffel (SS), a military commander, and a leading member of the Nazi Party (NSDAP). As Chief of the German Police and the Minister of the Interior from 1943, Himmler oversaw all internal and external police and security forces, including the Gestapo (Secret State Police). Serving as Reichsführer and later as Commander of the Replacement (Home) Army and General Plenipotentiary for the entire Reich's administration (Generalbevollmächtigter für die Verwaltung), Himmler was one of the most powerful men in Nazi Germany and one of the persons most directly responsible for the Holocaust.

As overseer of the concentration camps, extermination camps, and Einsatzgruppen (literally: task forces, often used as death squads operating to the rear of frontline troops to murder Jews, communists and 'untermensch' in occupied territories), Himmler coordinated the killing of some six million Jews, between 200,000 and 500,000 Roma, many prisoners of war, and possibly another three to four million Poles, as well as other groups whom the Nazis deemed unworthy to live, including people with physical and mental disabilities, Jehovah's Witnesses, members of the Confessing Church, and homosexuals. Shortly before the end of the war, he offered to surrender both Germany and himself to the Western Allies if he were spared prosecution. After being arrested by British forces on 22 May 1945, he committed suicide the following day before he could be questioned.