Commemorations in the city of Lublin were slated to include a wreath-laying ceremony at a monument to victims of the camp and a meeting with families of survivors.
Poland’s Deputy Prime Minister and Culture Minister Piotr Gliński was expected to address participants.
The Nazi concentration camp of Majdanek, known as Konzentrationslager Lublin, existed in German-occupied eastern Poland between October 1941 and July 1944. It was one of the first concentration camps to be liberated by Allied forces during World War II.
Around 80,000 people, most of them Jews, lost their lives at the camp.