Muḥammad ibn Mūsā al-Khwārizmī
A stamp issued 6 September 1983 in the Soviet Union, to celebrate roughly 1200 years since al-Khwārizmī's birth
Born	c. 780
Died	c. 850

Muḥammad ibn Mūsā al-Khwārizmī (Persian: محمد بن موسى خوارزمی, Arabic: محمد بن موسى الخوارزمي) was a Persianmathematician and astronomer. He was believed to have been born around 800 AD and died in 850 AD during the Abbasid Empire.

Al-Khwarizmi was known for the book he wrote about algebra, Compendious Book on Calculation by Completion and Balancing. He also wrote a book which taught the Western world about Hindu numerals and how to use them. This book was later titled the Hindu Art of Reckoning. With his books, al-Khwarizmi authored astronomical tables- tables designed to calculate the position of planets or eclipses.