Al-Ḥasan ibn ʻAlī al-Barbahārī was a Muslim theologian and populist religious leader from Iraq. He was a scholar and jurist who is famous for his role in suppressing S̲h̲īʿa missionaries and Mu'tazilism in the Abbasid Caliphate during the 10th–11th (4th–5th AH) centuries. His books include creedal and methodological refutations against the Shias, Qadaris, Mu'tazilites and Ash'aris.