Abū Saʿīd Sinān ibn Thābit ibn Qurra (Arabic: أبو سعيد سنان بن ثابت بن قرة), c. 880–943, was a medieval scholar who served as the court physician of the Abbasid caliphs al-Muqtadir (r. 908–934), al-Qahir (r. 932–934), and al-Radi (r. 934–940).
As the son of Thabit ibn Qurra (c. 830–901) and the father of Ibrahim ibn Sinan (908–946), Sinan belonged to an illustrious family of astronomers and mathematicians who hailed from the Upper-Mesopotamian city of Harran and who worked at the Abbasid court in Baghdad. He and his family belonged to a religious sect of star worshippers known as the Sabians of Harran, though Sinan was forced to convert to Islam during al-Qahir's brief reign (932–934), in which the Abbasid caliph persecuted the Sabians and eventually forced Sinan to flee to Khurasan for a short period.
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