Giovanni Bianchini (in Latin, Johannes Blanchinus) (1410 – c. 1469) was a professor of mathematics and astronomy at the University of Ferrara and court astrologer of Leonello d'Este. He was an associate of Georg Purbach and Regiomontanus. In the letters exchanged with Regiomontanus 1463/4 are mentioned works of Bianchini: Primum mobile including astronomical tables, Flores almagesti, Compositio instrumenti.
Bianchini was the first mathematician in Europe to use decimal positional fractions for his trigonometric tables, at the same time as Al-Kashi in Samarkand. In De arithmetica, part of the Flores almagesti, he uses operations with negative numbers and expresses the Law of Signs.
He was probably the father of the instrument maker Antonio Bianchino.
Giovanni Bianchini should not be confused with two similarly-named Italians with their own lunar craters: Francesco Bianchini (1662–1729) (and the Bianchini crater), and Giuseppe Biancani (1566–1624) (and the crater Blancanus crater).
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