A Jewish holiday or festival is a day or series of days observed by Jews as a holy or secular commemoration of an important event in Jewish history. In Hebrew, Jewish holidays and festivals, depending on their nature, may be called yom tov ("good day") (Yiddish: yontif) or chag ("festival") or ta'anit ("fast").

The origins of various Jewish holidays can generally be found in Biblical mitzvot (commandments), rabbinical mandate, and modern Israeli history.

You can select from the menu on the right to read about these and other important days in the Jewish calendar.