The Mass Extermination of Jews in German Occupied Poland was a brochure published by the Polish government-in-exile in 1943 to disseminate the text of Raczyński's Note of 10 December 1942.

The most important item was Raczyński's Note, sent on 10 December 1942 to the foreign ministers of the 26 government signatories of the Declaration by United Nations.

[4][5]: 200  Based on intelligence from the Home Army's Jewish Affairs Bureau, Raczyński described the Germans' initial shooting executions and subsequent lethal gassings of Polish Jews.

[8] The brochure was published in 1943[1][2] and contained also the text of the Joint Declaration by Members of the United Nations of 17 December 1942, and an excerpt of a statement by Deputy Prime Minister Stanisław Mikołajczyk of 27 November 1942.

[10] Modern commentators have raised questions as to why the report was not published sooner, because the Polish government-in-exile had been kept apprised of the events in Poland by the underground state, the Jewish Labor Bund, and others.