Libert Froidmont (Latin: Libertus Fromondus; 3 September 1587, in Haccourt-Liège – 28 October 1653, in Louvain) a son of Gerard Libert de Froidmont and Marguerite Radoux, was a Liégeois theologian and scientist.

He was a close companion to Cornelius Jansen and corresponded with René Descartes.

Froidmont was educated by the Jesuits in his native Haccourt, near Liège, and studied philosophy in Louvain at the Falcon college.

He became friends with Jansenius but did not pursue his studies and instead went to teach first at Antwerp and later back at Louvain.

Acknowledging him as an authority on meteors, Descartes sent him his Discourse on the Method, which Froidmont received rather critically.