Based on the search results, there is no Jewish holiday today, Monday, October 30, 2023. However, there are several Jewish holidays happening in 2023, including:

• Tu B’shevat - February 6
• Purim - March 7
• Pesach / Passover - April 5-13
• Yom Hashoah - April 18
• Yom Hazikaron - April 25
• Yom Haatzmaut - April 26
• Yom Yerushalayim - May 19
• Shavuot - May 26-27
• Tisha BAv - August 1
• Rosh Hashanah - September 25-27
• Yom Kippur - October 4-5
• Sukkot - October 9-15
• Shmini Atzeret and Simchat Torah - October 16-18
• Hanukkah - December 7-15

It is important to note that Jewish holidays begin at sunset on the previous day and end at dusk on the last day of the holiday.