This study uses the case of Holocaust Day in Israel to examine the premise that national days impact national identity and collective memory. Specifically, the study examines whether a very unique type of national day—Holocaust Day—impacts national identification, nationalism, and collective memory in the form of Israeli Jews' perceptions of the “lessons” of the Holocaust. This study uses panel survey design data on national identity and perceptions of the Holocaust's lessons from the same sample of Israeli Jews (N = 665) collected two months prior to Holocaust Day and again during and after Holocaust Day.