Muqtadā al-Ṣadr or Moktada al-Sadr (سيد مقتدى الصدر) (born August 12, 1973) is an Iraqi theologian and political leader.

Along with Ali al-Sistani and Ammar al-Hakim of the Supreme Islamic Iraqi Council, Sadr is one of the most influential religious and political figures in the country not holding any official title in the Iraqi government.

Muqtada al-Sadr is the fourth son of a famous Iraqi Shi‘a cleric, the late Grand Ayatollah Mohammad Mohammad Sadeq al-Sadr. He is also the son-in-law of Grand Ayatollah Mohammad Baqir As-Sadr.