The International Holocaust Remembrance Day, or the International Day in Memory of the Victims of the Holocaust, is an international memorial day on 27 January that commemorates the victims of the Holocaust, which resulted in the genocide of one third of the Jewish people, along with countless members of other minorities by Nazi Germany between 1933 and 1945, an attempt to implement its "final solution" to the Jewish question. 27 January was chosen to commemorate the date when the Auschwitz concentration camp was liberated by the Red Army in 1945.

Auschwitz concentration camp was a complex of over 40 concentration and extermination camps operated by Nazi Germany in occupied Poland during World War II and the Holocaust. It consisted of Auschwitz I, the main camp (Stammlager) in Oświęcim; Auschwitz II-Birkenau, a concentration and extermination camp with gas chambers; Auschwitz III-Monowitz, a labour camp for the chemical conglomerate IG Farben; and dozens of subcamps. The camps became a major site of the Nazis' Final Solution to the Jewish question.