Janowska concentration camp was a German Nazi concentration camp combining elements of labor, transit, and extermination camps. It was established in September 1941 on the outskirts of Lwów in what had become, after the German invasion, the General Government. The camp was named after the nearby street Janowska in Lwów of the interwar Second Polish Republic.

Nazi Germany used six extermination camps, also called death camps, or killing centers, in Central Europe during World War II to systematically murder over 2.7 million people – mostly Jews – in the Holocaust. The victims of death camps were primarily murdered by gassing, either in permanent installations constructed for this specific purpose, or by means of gas vans. The six extermination camps were Chełmno, Belzec, Sobibor, Treblinka, Majdanek and Auschwitz-Birkenau. Extermination through labour was also used at the Auschwitz and Majdanek death camps. Millions were also murdered in concentration camps, in the Aktion T4, or directly on site.