3

Are you allowed to fast on Chanukah?

5

No. From the Shulchan Aruch, Orach Chaim 670:1:

ב כ״ה בכסליו מתחילין ח׳ ימי חנוכה ואסורים בהספד ותענית

Translated:

The eight days of Chanukah begin on the 25th of Kislev, and eulogies and fasts are prohibited on these days.

However, the Aruch Hashulchan states in Orach Chaim 670:6 that a fast because of a bad dream (a "Taanis Chalom" / "תענית חלום") would be permitted:

ובחנוכה אסור להתענות לבד תענית חלום דמתענין אפילו בשבת ויום טוב וצריך למיתב תענית לתעניתו כבשבת ויום טוב

Translated:

On Chanukah it is forbidden to fast, except for a Taanis Chalom (which may be observed even on Shabbos and Yom Tov). One must then observe an additional fast day in compensation for fasting [on Chanukah], just as is required for Shabbos and Yom Tov.

2

No. It's the only "Megillat Ta'anit" holiday that was not rescinded.

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