The Aktion Erntefest (German: Operation Harvest Festival) was a World War II mass shooting action carried out by the SS, the Order police, and the Ukrainian Sonderdienst formations in the General Government territory of occupied Poland. The operation aimed at extermination of Jews pressed into forced-labour at the camps of the Lublin reservation including Majdanek concentration camp and all its subcamps. It was closely linked with the liquidation of the ghetto in Lublin.