Jules Pierre François Stanislaus Desnoyers (8 October 1800 – 1 September 1887) was a French geologist and archaeologist.

[2] Parts of his collection of rare books in the earth sciences was bought by the United States Geological Survey Library at an auction in 1885.

His article on caves for the Dictionnaire universel d’histoire naturelle (1841-1849) of Charles Henry Dessalines d'Orbigny broke new ground, emphasizing the role of hydrological phenomena in limestone and gypsum caves.

His contributions to geological science comprise memoirs on the Jurassic, Cretaceous and Tertiary Strata of the Paris Basin and of Northern France, and other papers relating to the antiquity of man, and to the question of his co-existence with extinct mammalia.

[1] In 1829 he proposed the term Quaternary to cover those formations which were formed just anterior to the present, following an antiquated method of referring to geologic eras as "Primary," "Secondary," "Tertiary," and so on.