The Katzmann Report is one of the most important testimonies relating to the Holocaust in Poland and the extermination of Polish Jews during World War II. It was used as evidence in the Nuremberg Trials and numerous other proceedings against war criminals abroad. It is a leather-bound report by SS-Gruppenführer Fritz Katzmann, German SS and Police Leader (SSPF) in the District of Galicia, entitled "Lösung der Judenfrage im Distrikt Galizien", submitted on June 30, 1943 to his superior officer, the Higher SS and Police Leader (HSSPF) "Ost" (East), SS-Obergruppenführer Friedrich-Wilhelm Krüger. It describes part of Operation Reinhard.

Operation Reinhard or Operation Reinhardt was the codename of the secret German plan in World War II to exterminate Polish Jews in the General Government district of German-occupied Poland. This deadliest phase of the Holocaust was marked by the introduction of extermination camps. The operation proceeded from March 1942 to November 1943; about 1.47 million or more Jews were murdered in just 100 days from late July to early November 1942, a rate which is approximately 83% higher than the commonly suggested figure for the kill rate in the Rwandan genocide. In the time frame of July to October 1942, the overall death toll, including all killings of Jews and not just Operation Reinhard, amounted to two million killed in those four months alone. It was the single fastest rate of genocidal killing in history.