Étienne Bobillier (17 April 1798 – 22 March 1840) was a French mathematician.
However, due to a shortage of money, in 1818 he became an instructor in mathematics at the École des Arts et Métiers in Châlons-sur-Marne.
In 1832 he returned to Châlons after his post was abolished, and was promoted to professor.
In 1836 he began suffering from health problems, but continued teaching; declining to take a leave to recuperate.
He is noted for his work on geometry, particularly the algebraic treatment of geometric surfaces and the polar of curves.