Abu 'Abd Allah Muhammad ibn Muhammad ibn al-Nu'man al-'Ukbari al-Baghdadi, known as al-Shaykh al-Mufid (Persian: ??? ????) and Ibn al-Mu'allim (c.
948–1022 CE), was a prominent Twelver Shia theologian.
His father was a teacher (mu'allim), hence the name Ibn al-Mu'allim.
The title "al-Mufid" was given to him either by Muhammad al-Mahdi, the twelfth Shia Imam, or by al-Rummani, a Sunni scholar, after a conversation with him.
The leader of the Shia community, he was a mutakallim, theologian, and Shia jurist.
He was taught by Al-Shaykh al-Saduq, Ibn Qulawayh, Abu Abdallah al-Basri and al-Rummani, and Sharif al-Murtaza and Shaykh Tusi were among his students.
Only 10 of his 200 works have survived, among which are Amali, Al-Irshad, Al-Muqni'ah, and Tashih al-Itiqadat.