January 27 is International Holocaust Remembrance Day as proclaimed by the United Nations in 2005.
US Second Gentleman Douglas Emhoff, the husband of Vice President Kamala Harris, and a group of foreign diplomats posted in Poland are expected to be among those attending the ceremonies at the site of the former Auschwitz-Birkenau camp, together with about 20 surviving former prisoners.
Russian officials have not been invited to take part in the event.
Polish Foreign Minister Zbigniew Rau said in a tweet: "Today, 78 years after the liberation of the German Nazi concentration and extermination camp Auschwitz-Birkenau, the memory of the atrocities of those events is still alive. The result of hatred was a planned, horrific crime. Its traces will forever remain in our minds."
The Polish foreign ministry said that Auschwitz-Birkenau "will forever remain a symbol of the extermination that costed the lives of more than a million victims."
The Auschwitz-Birkenau camp operated in German-occupied southern Poland between May 1940 and January 1945. It was the largest of the German Nazi concentration and death camps during World War II.
More than 1.1 million people, mostly European Jews, as well as Poles, Roma, Soviet POWs and people of many other nationalities, perished there before the camp was liberated by Soviet soldiers on January 27, 1945.
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Source: IAR, PAP