Sadr (as-Sadr or al-Sadr) (الصدر) is a family name originating in Lebanon and a branch of Musawi family tracing to Musa Ibn Jaafar the seventh Shia Imam.
Sadr is a branch of Sharafeddine (Arabic:شرف الدين) family from Jabal Amel in Lebanon. The Sharafeddine family itself is a branch of the Nour eddine family, which traces its lineage to Musa al-Kazim (the seventh Shi'a Imam) and through him to the first Imam, Ali ibn Abi Talib and Fatima Zahra, the daughter of Muhammad (d.632). The as-Sadr family has produced numerous Islamic scholars in Iran, Lebanon, and Iraq, including Ismail as-Sadr (d. 1919) and his grandsons Musa Sadr (disappeared in Libya in 1978) and Mohammad Baqir as-Sadr (d.1980).
Ancestor of the Sadr family, Seyyed Saleh Musawi Ameli, was a descendant of Musa al-Kazim, the seventh Shi'a Imam, through 27 generations: