Heinrich Luitpold Himmler (pronounced [ˈhaɪnʁɪç ˈluˑɪtˌpɔlt ˈhɪmlɐ] ( listen) 7 October 1900 – 23 May 1945) was Reichsführer of the SS, a military commander, and a leading member of the Nazi Party. 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, communists, or other groups whom the Nazis deemed unworthy to live, including homosexuals, people with physical and mental disabilities, Jehovah's Witnesses, and members of the Confessing Church. 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.