Shemini Atzeret is a Jewish holiday. It is celebrated on the 22nd day of the Hebrew month of Tishrei in the Land of Israel, and on the 22nd and 23rd outside the Land, usually coinciding with late September or early October. It directly follows the Jewish festival of Sukkot which is celebrated for seven days, and thus Shemini Atzeret is literally the eighth day. It is a separate—yet connected—holy day devoted to the spiritual aspects of the festival of Sukkot. Part of its duality as a holy day is that it is simultaneously considered to be both connected to Sukkot and also a separate festival in its own right.

Jewish holidays, also known as Jewish festivals or Yamim Tovim, are holidays observed by Jews throughout the Hebrew calendar. They include religious, cultural and national elements, derived from three sources: mitzvot, rabbinic mandates, the history of Judaism, and the State of Israel.