Jules Tannery (24 March 1848 – 11 December 1910) was a French mathematician, who notably studied under Charles Hermite and was the PhD advisor of Jacques Hadamard.

[2] Tannery discovered a surface of the fourth order of which all the geodesic lines are algebraic.

He once remarked, "Mathematicians are so used to their symbols and have so much fun playing with them, that it is sometimes necessary to take their toys away from them in order to oblige them to think."

He notably influenced Pierre Duhem, Paul Painlevé, Jules Drach, and Émile Borel to take up science.

Tannery was "an original thinker, a successful teacher, and a writer endowed with an unusually clear, brilliant and attractive style.