Ernest Charles Philippe Auguste Munier-Chalmas[1] (7 April 1843 – 9 August 1903) was a French geologist, born at Tournus in Burgundy, who is known for his contributions to the understanding of the Cretaceous, but who also isolated and defined the Priabonian stage of the Late Eocene, in a paper co-written with Albert de Lapparent in 1893.

From 1882 he taught classes at the École Normale Supérieure, and in 1891 became a professor of geology at the Sorbonne.

In addition, from 1892 to 1903, he was director of studies at the École pratique des hautes études.

[3][4] With paleontologist Charles Schlumberger, he conducted important investigations on sexual dimorphism in Foraminifera.

[6] In 1895, botanist Hermann zu Solms-Laubach published Chalmasia, which is a genus of green algae in the family Polyphysaceae and name in Chalmas's honour.