Mā Shā’ Allāh ibn Athari () (c.740–815 CE) was an eighth-century Persian Jewish astrologer, astronomer, and mathematician. Originally from Khorasan he lived in Basra (present day Iraq) during the reigns of al-Manṣūr and al-Ma’mūn, and was among those who introduced astrology and astronomy to Baghdād in the late 8th and early 9th century. The bibliographer al-Nadim in his "Fihrist", described him "as virtuous and in his time a leader in the science of jurisprudence, i.e. the science of judgments of the stars". He served as a court astrologer for the Abbasid caliphate, and wrote numerous works on astrology in Arabic. Some Latin translations survive.