Dachau () was the first concentration camp built by Nazi Germany, opening on 22 March 1933. The camp was initially intended to intern Hitler's political opponents which consisted of: communists, social democrats, and other dissidents. It is located on the grounds of an abandoned munitions factory northeast of the medieval town of Dachau, about 16 km (10 mi) northwest of Munich in the state of Bavaria, in southern Germany. After its opening by Heinrich Himmler, its purpose was enlarged to include forced labor, and, eventually, the imprisonment of Jews, Romani, German and Austrian criminals, and, finally, foreign nationals from countries that Germany occupied or invaded. The Dachau camp system grew to include nearly 100 sub-camps, which were mostly work camps or Arbeitskommandos, and were located throughout southern Germany and Austria. The main camp was liberated by U.S. forces on 29 April 1945.

Prisoners lived in constant fear of brutal treatment and terror detention including standing cells, floggings, the so-called tree or pole hanging, and standing at attention for extremely long periods. There were 32,000 documented deaths at the camp, and thousands that are undocumented. Approximately 10,000 of the 30,000 prisoners were sick at the time of liberation.In the postwar years, the Dachau facility served to hold SS soldiers awaiting trial. After 1948, it held ethnic Germans who had been expelled from eastern Europe and were awaiting resettlement, and also was used for a time as a United States military base during the occupation. It was finally closed in 1960.

There are several religious memorials within the Memorial Site, which is open to the public.

Reichsführer-SS (German: [ˈʁaɪçsˌfyːʁɐ ˌʔɛsˈʔɛs] (listen), lit. 'Reich Leader-SS') was a special title and rank that existed between the years of 1925 and 1945 for the commander of the Schutzstaffel (SS). Reichsführer-SS was a title from 1925 to 1933, and from 1934 to 1945 it was the highest rank of the SS. The longest-serving and most noteworthy office holder was Heinrich Himmler.