Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist. Valenciennes was born in Paris, and studied under Georges Cuvier. His study of parasitic worms in humans made an important contribution to the study of parasitology. He also carried out diverse systematic classifications, linking fossil and current species. Working in the scientific field of herpetology, Valenciennes described two new species of reptiles. The organ of Valenciennes, a part of the anatomy of a female of the genus Nautilus, the purpose of which remains unknown, is named after him.