Sayyid Muqtadā al-Ṣadr (Arabic: سيد مقتدى الصدر) (born August 12, 1973) is an Iraqi Islamic political leader.
Along with Ali al-Sistani and Ammar al-Hakim of the Islamic Supreme Council of Iraq, Sadr is one of the most influential religious and political figures in the country not holding any official title in the Iraqi government.
He is often referred to as Sayyid Muqtada al-Sadr. The title Sayyid (approx. "Mr." or "Sir") is generally used among the Shi‘a to denote persons descending directly from the Prophet Muhammad, through his daughter Fatimah's marriage with Ali. Thus a great deal of respect is paid by the Shi'as to the Sayyids throughout Shi'a society. The al-Sadr family has a clear and distinct lineage that can be traced directly to Muhammad. The lineage is traced through Imam Jafar al-Sadiq and his son Imam Musa al-Kadhim, the sixth and seventh Shi‘a Imams respectively.