Grand Ayatollah Mirza Mahdi al-Husayni al-Shirazi (Arabic: مهدي الحسيني الشيرازي; Persian: مهدی حسینی شیرازی; 9 May 1887 – 14 February 1961), also known as Mirza Mahdi al-Shirazi, was an Iraqi-Iranian Shia marja. After the death of Abu al-Hasan al-Esfehani and , Mirza Mahdi was considered to be the highest ranking cleric in Karbala, and one of the highest in Iraq, along with Muhsin al-Hakim and his second cousin once removed, Abd al-Hadi al-Shirazi in Najaf. Mirza Mahdi was the Imam of the Imam Husayn Shrine.