Historical negationism, also called historical denialism, is falsification or distortion of the historical record. This is not the same as historical revisionism, a broader term that extends to newly evidenced, fairly reasoned academic reinterpretations of history. In attempting to revise the past, historical negationism acts as illegitimate historical revisionism by using techniques inadmissible in proper historical discourse, such as presenting known forged documents as genuine, inventing ingenious but implausible reasons for distrusting genuine documents, attributing conclusions to books and sources that report the opposite, manipulating statistical series to support the given point of view, and deliberately mistranslating texts.

Holocaust denial is an antisemitic conspiracy theory that asserts that the Nazi genocide of Jews, known as the Holocaust, is a fabrication or exaggeration. Holocaust denial includes making one or more of the following false claims:Nazi Germany's "Final Solution" was aimed only at deporting Jews from the territory of the Third Reich and did not include their extermination. Nazi authorities did not use extermination camps and gas chambers for the mass murder of Jews. The actual number of Jews murdered is significantly lower than the accepted figure of approximately six million. The Holocaust is a hoax perpetrated by the Allies, Jews, or the Soviet Union.