Ahmad ibn Muhammad al-Nahawandi () was a Persian astronomer of the 8th and 9th centuries. His name indicates that he was from Nahavand, a city in modern Iran. Al-Nahawandi lived and worked at the Academy of Gundishapur, in Khuzestan, Iran, at the time of Yahya ibn Khalid ibn Barmak, who died in 803 AD, where he is reported to have been making astronomical observations in around 800. He and Mashallah ibn Athari were among the earliest Islamic era astronomers who flourished during the reign of al-Mansur, the second Abbasid caliph. Al-Nahawandi compiled tables called the comprehensive (Mushtamil). References Sources H. Suter: Die Mathematiker und Astronomen der Araber (10, 1900) Year of birth unknown People from Nahavand 9th-century Iranian astronomers Astronomers of the medieval Islamic world 9th-century people from the Abbasid Caliphate 9th-century Iranian mathematicians