Babi Yar (Russian: Бабий Яр; Ukrainian: Бабин Яр, Babyn Yar) is a ravine in the Ukrainian capital Kiev and a site of a series of massacres carried out by the Nazis during their campaign against the Soviet Union.
The most notorious and the best documented of these massacres took place on September 29–30, 1941, wherein 33,771 Jews were killed in a single operation. The decision to kill all the Jews in Kiev was made by the military governor, Major-General Kurt Eberhard, the Police Commander for Army Group South, SS-Obergruppenführer Friedrich Jeckeln, and the Einsatzgruppe C Commander Otto Rasch. It was carried out by Sonderkommando 4a soldiers, along with the aid of the SD and SS Police Battalions. The massacre was the largest single mass killing for which the Nazi regime and its collaborators were responsible during its campaign against the Soviet Union and is considered to be "the largest single massacre in the history of the Holocaust".
Victims of other massacres at the site included thousands of Soviet POWs, communists, Gypsies (Romani people), Ukrainian nationalists and civilian hostages. It is estimated that between 100,000 and 150,000 more lives were taken at Babi Yar.