23 Ramadan is the twenty-third day of the ninth month (Ramadan) of the Islamic calendar.

In the Lunar Hijri calendar, this day is the 259th day of the year.

• 220 AH – Ahmad ibn Tulun, the founder of the Tulunid dynasty that ruled Egypt and Syria between 868 and 905 AD^[1][2]

• 247 AH – Ahmad ibn Isa ibn Zayd,^[3] the grandson of Zayd ibn Ali, one of the famous Alawites of the early Abbasid caliphate and one of the famous Zaidiyyah scholars^[4][5]
• 539 AH – Fatemeh Baghdadieh, an Iraqis Hadith scholar woman who lived mostly in Isfahan^[6][7]
• 1384 AH – Javad Fumani Haeri,^[8][9][10] an Iranian Ayatollah, revolutionary fighter and Shia scholar^[11][12]

• 491 AH – Occupation of Jerusalem by the Crusaders^[13][14][15]
• 1254 AH – End of writing the valuable jurisprudential book "Jawahir al-Kalam"^[16] by Muhammad Hasan al-Najafi^[17][18]
• 1261 AH – End of writing the perfect book on Islamic philosophy "Manẓuma"^[19][20] by Hadi Sabzavari^[21][22]
• 1392 AH – End of writing the notable tafsir (exegesis of the Quran) "Tafsir al-Mizan" by Muhammad Husayn Tabatabai^[18][23][24]
• The day of the revelation of the Quran, holy book of Islam (more probable, according to the narrations)^{[25][26][27][28][29][30]}

• The third Qadr Night of Ramadan according to Shiites and most important of them, holding an official nightlife worship ceremony called Ehya night in Iran^{[31][32][33][34]}

• 19 Ramadan
• 21 Ramadan
• 13 Rajab