Grand Ayatollah Sayyid Abu al-Hasan Musawi Isfahani (Persian: ابوالحسن موسوی اصفهانی) (Arabic: أبوالحسن الموسوي الأصفهاني); 1861 – November 4, 1946) was an Iranian Shia marja'.

Isfahani passed his preliminary training in Nimarud School in Isfahan and travelled to Najaf in 1890.

After the death of his contemporary scholar, Ayatollah Mirza Hussein Naini, he became the sole Marja' for most of Shia Muslims.

Musa Musawi was a renowned academic and philosopher, who wrote a revisionist text on Shia Islam where he sought to purify schism from innovation and bring it closer to the majority of Muslims.

[1] In Fiqh, Wasila al-Naja which due to its comprehensive nature, has been elucidated by many Fuqaha including Ruhollah Khomeini.