赎罪日（希伯来语：יום כיפור‎，英语：Yom Kippur）是在希伯来历提斯利月之第十天，也是敬畏之日（Yamim Noraim）之一。是犹太人每年最神圣的日子，当天会全日禁食和恒常祈祷。据称是上帝透过摩西与亚伦，要求犹太人尊守的。旧约明载赎罪节的规定：「以色列要永远尊守下列条例。每年七月初十，以色列人和住在他们中间的外侨必须禁食，不准工作。那一天要行赎罪礼，洁净他们，使他们得以在上主面前洁净……这些条例必须永远尊守。（利未记：十六章二十九〜三十四节」）

Yom Kippur (/jɔːm ˈkɪpər, joʊm, jɒm/; Hebrew: יוֹם כִּפּוּר, IPA: [ˈjom kiˈpuʁ], or יום הכיפורים), also known as the Day of Atonement, is the holiest day of the year in Judaism. Its central themes are atonement and repentance. Jewish people traditionally observe this holy day with an approximate 25-hour period of fasting and intensive prayer, often spending most of the day in synagogue services.