Rosh HaShanah is the New Year in Judaism. The biblical name for this holiday is Yom Teruah. It is the first of the High Holy Days, as specified by Leviticus 23:23–25, that occur in the late summer/early autumn of the Northern Hemisphere. Rosh Hashanah begins ten days of penitence culminating in Yom Kippur, as well as beginning the cycle of autumnal religious festivals running through Sukkot which end on Shemini Atzeret in Israel and Simchat Torah everywhere else.

The New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one. Many cultures celebrate the event in some manner. In the Gregorian calendar, the most widely used calendar system today, New Year occurs on January 1. This was also the first day of the year in the original Julian calendar and the Roman calendar.