Achille Valenciennes (9 August 1794 – 13 April 1865) was a French zoologist.

He also carried out diverse systematic classifications, linking fossil and current species.

Early in his career, he was given the task of classifying animals described by Alexander von Humboldt (1769–1859) during his travels in the American tropics (1799 to 1803), and a lasting friendship was established between the two men.

Working in the scientific field of herpetology, Valenciennes described two new species of reptiles.

[5] 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.