September 21
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September 21 is the 264th day of the year (265th in leap years) in the Gregorian calendar; 101 days remain until the end of the year.
- 1934 CE - Demise of Abu l-Qasim Qummi, one of the Shi'a jurists of Qom. (Jumada II 11, 1353)
- 2026 CE – Demise of Sayyid Musa Shubayri Zanjani, a Shia marja' and Master of advanced jurisprudence and principles of jurisprudence in Seminary of Qom. (Rabi' II 9, 2026 CE)