Grand Ayatollah Mohammad Mohammad Sadeq al-Sadr (Arabic: محمد محمّد صادق الصدر‎; Muḥammad Muḥammad Ṣādiq aṣ-Ṣadr) (March 23, 1943 – February 19, 1999), often referred to as Muhammad Sadiq as-Sadr which is his father's name, was a prominent Iraqi Twelver Shi'a cleric of the rank of Grand Ayatollah. He called for government reform and the release of detained Shi'a leaders.