Muḥammad Bāqir al-Bahbahānī (Arabic: محمد باقر البَهبَهاني) (b. 1118/1706-7 - d. 1205/1791) known as al-Waḥīd al-Bahbahānī (Arabic: الوحيد البَهبَهاني), was a Twelver Shi'a scholar in fiqh, usul and an author in 12th/18th century. He was titled as Wahid al-'Asr (The Exceptional of the time) by al-Sayyid Muhammad al-Tabataba'i al-Isfahani so he is titled as al-Wahid al-Bahbahani.
After settling in Karbala, al-Wahid al-Bahbahani attended the classes of al-Shaykh Yusuf al-Bahrani (d. 1186/1772). Al-Bahrani was a grand figure in fiqh and the last representative of Akhbarism. Al-Bahbahani requested al-Bahrani to take over his classes for some time. He asked al-Bahrani to encourage his students to attend his classes. Al-Bahrani took over the biggest class of the time. Al-Bahbahani explained Usuli school of thought and gave reviews on Akhbari principles in three days. As a result two third of students quit Akhbarism and accepted Usuli school of thought. Read more