Shaikh Mohammad Razaullah Ansari (8 April 1932 – 25 February 2023) was an Indian historian of science, physicist, astronomer and writer.

He worked there first at the Institute of Theoretical Physics and later shifted to Eberhard Karl University at Tübingen (Germany), where he completed his D.Sc.

During his sojourn in Germany, he specialized also in the history of exact science in India and Islamic countries.

In 1997, he organized a symposium on History of Oriental Astronomy at the General Assembly of IAU, held in Kyoto, the proceedings of which were edited by him and published.

[1] His works are extant in the field of Venus and it's transit, the sun, astronomy in medieval islam and indian astronomy where he is well cited[2] He was awarded Humboldt Fellowship, Alexander von Humboldt Foundation to work in Germany He contributed many chapters on history of science in many books, but here are some of his books based on Zij, Avempace, Qotb al-Din Shirazi that he edited: